Annual report pursuant to Section 13 and 15(d)

Condensed Financial Information Of Registrant (Condensed Statements Of Cash Flows) (Details)

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Condensed Financial Information Of Registrant (Condensed Statements Of Cash Flows) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash provided by operating activities $ 278,691,000 $ 261,696,000 $ 168,932,000
Purchases of investments (695,687,000) (318,397,000) (615,506,000)
Sales and maturities of investments 589,921,000 267,404,000 570,423,000
Acquisitions, net of cash required 0 (4,375,000) (60,388,000)
Proceeds from asset sales 0 0 13,420,000
Net cash used in investing activities (187,910,000) (129,076,000) (210,607,000)
Proceeds from borrowings 400,500,000 419,183,000 218,538,000
Payment of long-term debt and notes payable (218,234,000) (416,283,000) (195,728,000)
Proceeds from exercise of stock options 15,912,000 15,815,000 3,419,000
Common stock offering 0 0 104,534,000
Common stock repurchases (12,741,000) (7,809,000) (3,224,000)
Debt issue costs (3,623,000) (9,242,000) (769,000)
Purchase of noncontrolling interest (14,429,000) 0 (48,257,000)
Excess tax benefits from stock compensation 10,996,000 4,435,000 963,000
Net cash provided by financing activities 179,473,000 6,912,000 72,089,000
Net (decrease) increase in cash and cash equivalents 270,254,000 139,532,000 30,414,000
Cash and cash equivalents, beginning of period 573,698,000 434,166,000 403,752,000
Cash and cash equivalents, end of period 843,952,000 573,698,000 434,166,000
Parent Company [Member]
      
Cash provided by operating activities 327,940,000 72,754,000 23,504,000
Net dividends from and capital contributions to subsidiaries (539,575,000) (50,581,000) (17,172,000)
Purchases of investments (7,320,000) (21,915,000) (86,549,000)
Sales and maturities of investments 30,000,000 11,111,000 90,121,000
Acquisitions, net of cash required 0 (1,773,000) (48,656,000)
Proceeds from asset sales 0 0 13,420,000
Net cash used in investing activities (516,895,000) (63,158,000) (48,836,000)
Proceeds from borrowings 400,500,000 419,183,000 91,000,000
Payment of long-term debt and notes payable (215,000,000) (413,644,000) (115,000,000)
Proceeds from exercise of stock options 15,912,000 15,815,000 3,419,000
Common stock offering 0 0 104,534,000
Common stock repurchases (12,741,000) (7,809,000) (3,224,000)
Debt issue costs (3,623,000) (9,242,000) 0
Distribution to noncontrolling interest 0 0 (8,158,000)
Contributions from noncontrolling interest 1,092,000 813,000 771,000
Purchase of noncontrolling interest (14,429,000) 0 (48,257,000)
Excess tax benefits from stock compensation 10,996,000 4,435,000 963,000
Net cash provided by financing activities 182,707,000 9,551,000 26,048,000
Net (decrease) increase in cash and cash equivalents (6,248,000) 19,147,000 716,000
Cash and cash equivalents, beginning of period 28,527,000 9,380,000 8,664,000
Cash and cash equivalents, end of period $ 22,279,000 $ 28,527,000 $ 9,380,000