Investments And Restricted Deposits (Tables)
|
9 Months Ended |
Sep. 30, 2011 |
|---|
| Investments And Restricted Deposits [Abstract] |
|
| Short-Term And Long-Term Investments And Restricted Deposits By Investment Type |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
September 30, 2011 |
|
|
December 31, 2010 |
|
| |
|
Amortized
Cost |
|
|
Gross
Unrealized
Gains |
|
|
Gross
Unrealized
Losses |
|
|
Fair
Value
|
|
|
Amortized
Cost |
|
|
Gross
Unrealized
Gains |
|
|
Gross
Unrealized
Losses |
|
|
Fair
Value
|
|
|
U.S. Treasury securities and obligations of U.S. government corporations and agencies
|
|
$ |
29,045 |
|
|
$ |
691 |
|
|
$ |
(2 |
) |
|
$ |
29,734 |
|
|
$ |
28,665 |
|
|
$ |
510 |
|
|
$ |
(140 |
) |
|
$ |
29,035 |
|
|
Corporate securities
|
|
|
189,380 |
|
|
|
3,825 |
|
|
|
(757 |
) |
|
|
192,448 |
|
|
|
197,577 |
|
|
|
3,124 |
|
|
|
(586 |
) |
|
|
200,115 |
|
|
Restricted certificates of deposit
|
|
|
5,890 |
|
|
|
— |
|
|
|
— |
|
|
|
5,890 |
|
|
|
6,814 |
|
|
|
— |
|
|
|
— |
|
|
|
6,814 |
|
|
Restricted cash equivalents
|
|
|
13,488 |
|
|
|
— |
|
|
|
— |
|
|
|
13,488 |
|
|
|
8,814 |
|
|
|
— |
|
|
|
— |
|
|
|
8,814 |
|
|
Municipal securities:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
General obligation
|
|
|
117,544 |
|
|
|
3,167 |
|
|
|
(57 |
) |
|
|
120,654 |
|
|
|
109,866 |
|
|
|
3,601 |
|
|
|
(6 |
) |
|
|
113,461 |
|
|
Pre-refunded
|
|
|
32,682 |
|
|
|
613 |
|
|
|
— |
|
|
|
33,295 |
|
|
|
32,442 |
|
|
|
756 |
|
|
|
— |
|
|
|
33,198 |
|
|
Revenue
|
|
|
114,675 |
|
|
|
2,768 |
|
|
|
(16 |
) |
|
|
117,427 |
|
|
|
100,198 |
|
|
|
2,781 |
|
|
|
(15 |
) |
|
|
102,964 |
|
|
Variable rate demand notes
|
|
|
108,723 |
|
|
|
— |
|
|
|
— |
|
|
|
108,723 |
|
|
|
106,540 |
|
|
|
— |
|
|
|
— |
|
|
|
106,540 |
|
|
Asset backed securities
|
|
|
18,714 |
|
|
|
492 |
|
|
|
— |
|
|
|
19,206 |
|
|
|
17,391 |
|
|
|
243 |
|
|
|
(43 |
) |
|
|
17,591 |
|
|
Cost method investments and equity method securities
|
|
|
8,076 |
|
|
|
— |
|
|
|
— |
|
|
|
8,076 |
|
|
|
7,060 |
|
|
|
— |
|
|
|
— |
|
|
|
7,060 |
|
|
Life insurance contracts
|
|
|
14,623 |
|
|
|
— |
|
|
|
— |
|
|
|
14,623 |
|
|
|
14,391 |
|
|
|
— |
|
|
|
— |
|
|
|
14,391 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
$ |
652,840 |
|
|
$ |
11,556 |
|
|
$ |
(832 |
) |
|
$ |
663,564 |
|
|
$ |
629,758 |
|
|
$ |
11,015 |
|
|
$ |
(790 |
) |
|
$ |
639,983 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Schedule Of Available-For-Sale Investments In A Continuous Unrealized Loss Position |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
September 30, 2011 |
|
|
December 31, 2010 |
|
| |
|
Less Than 12 Months |
|
|
12 Months or More |
|
|
Less Than 12 Months |
|
|
12 Months or More |
|
| |
|
Unrealized
Losses |
|
|
Fair
Value |
|
|
Unrealized
Losses |
|
|
Fair
Value |
|
|
Unrealized
Losses |
|
|
Fair
Value |
|
|
Unrealized
Losses |
|
|
Fair
Value |
|
|
U.S. Treasury securities and obligations of U.S. government corporations and agencies
|
|
$ |
(2 |
) |
|
$ |
2,117 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
(140 |
) |
|
$ |
9,246 |
|
|
$ |
— |
|
|
$ |
— |
|
|
Corporate securities
|
|
|
(757 |
) |
|
|
29,224 |
|
|
|
— |
|
|
|
— |
|
|
|
(586 |
) |
|
|
40,341 |
|
|
|
— |
|
|
|
— |
|
|
Municipal securities:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
General obligation
|
|
|
(57 |
) |
|
|
7,676 |
|
|
|
— |
|
|
|
— |
|
|
|
(6 |
) |
|
|
1,131 |
|
|
|
— |
|
|
|
— |
|
|
Revenue
|
|
|
(16 |
) |
|
|
7,039 |
|
|
|
— |
|
|
|
— |
|
|
|
(15 |
) |
|
|
2,419 |
|
|
|
— |
|
|
|
— |
|
|
Asset backed securities
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
(43 |
) |
|
|
5,276 |
|
|
|
— |
|
|
|
— |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
$ |
(832 |
) |
|
$ |
46,056 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
(790 |
) |
|
$ |
58,413 |
|
|
$ |
— |
|
|
$ |
— |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Contractual Maturities Of Short-Term And Long-Term Investments And Restricted Deposits |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
September 30, 2011 |
|
|
December 31, 2010 |
|
| |
|
Investments |
|
|
Restricted Deposits |
|
|
Investments |
|
|
Restricted Deposits |
|
| |
|
Amortized
Cost |
|
|
Fair
Value
|
|
|
Amortized
Cost |
|
|
Fair
Value |
|
|
Amortized
Cost |
|
|
Fair
Value
|
|
|
Amortized
Cost |
|
|
Fair
Value |
|
|
One year or less
|
|
$ |
104,914 |
|
|
$ |
106,344 |
|
|
$ |
19,605 |
|
|
$ |
19,606 |
|
|
$ |
21,141 |
|
|
$ |
21,346 |
|
|
$ |
17,387 |
|
|
$ |
17,392 |
|
|
One year through five years
|
|
|
391,281 |
|
|
|
400,055 |
|
|
|
7,092 |
|
|
|
7,162 |
|
|
|
464,270 |
|
|
|
474,255 |
|
|
|
5,368 |
|
|
|
5,366 |
|
|
Five years through ten years
|
|
|
35,748 |
|
|
|
35,748 |
|
|
|
— |
|
|
|
— |
|
|
|
39,732 |
|
|
|
39,731 |
|
|
|
— |
|
|
|
— |
|
|
Greater than ten years
|
|
|
94,200 |
|
|
|
94,649 |
|
|
|
— |
|
|
|
— |
|
|
|
81,860 |
|
|
|
81,893 |
|
|
|
— |
|
|
|
— |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
$ |
626,143 |
|
|
$ |
636,796 |
|
|
$ |
26,697 |
|
|
$ |
26,768 |
|
|
$ |
607,003 |
|
|
$ |
617,225 |
|
|
$ |
22,755 |
|
|
$ |
22,758 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Gross Recorded Realized Gains And Losses On Investments |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
Three Months Ended
September 30,
|
|
|
Nine Months Ended
September 30,
|
|
| |
|
2011 |
|
|
2010 |
|
|
2011 |
|
|
2010 |
|
|
Gains
|
|
$ |
107 |
|
|
$ |
2,310 |
|
|
$ |
240 |
|
|
$ |
6,027 |
|
|
Losses
|
|
|
(1 |
) |
|
|
(23 |
) |
|
|
(27 |
) |
|
|
(268 |
) |
|
Impairment of investment
|
|
|
— |
|
|
|
(5,531 |
) |
|
|
— |
|
|
|
(5,531 |
) |
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Net realized (losses) gains
|
|
$ |
106 |
|
|
$ |
(3,244 |
) |
|
$ |
213 |
|
|
$ |
228 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|