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 $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash provided by operating activities $ 382,526 $ 278,691 $ 261,696
Purchases of investments (790,653) (695,687) (318,397)
Sales and maturities of investments 579,161 589,921 267,404
Acquisitions, net of cash required (62,773) 0 (4,375)
Net cash used in investing activities (342,100) (187,910) (129,076)
Proceeds from borrowings 180,000 400,500 419,183
Payment of long-term debt and notes payable (41,593) (218,234) (416,283)
Proceeds from exercise of stock options 8,983 15,912 15,815
Common stock offering 15,225 0 0
Common stock repurchases (19,779) (12,741) (7,809)
Debt issue costs (3,589) (3,623) (9,242)
Purchase of noncontrolling interest 0 (14,429) 0
Excess tax benefits from stock compensation 6,380 10,996 4,435
Net cash provided by financing activities 153,695 179,473 6,912
Net (decrease) increase in cash and cash equivalents 194,121 270,254 139,532
Cash and cash equivalents, beginning of period 843,952 573,698 434,166
Cash and cash equivalents, end of period 1,038,073 843,952 573,698
Parent Company [Member]
     
Cash provided by operating activities 302,242 327,940 72,754
Net dividends from and capital contributions to subsidiaries (417,734) (539,575) (50,581)
Purchases of investments 12,518 (7,320) (21,915)
Sales and maturities of investments 10,252 30,000 11,111
Acquisitions, net of cash required 67,070 0 (1,773)
Net cash used in investing activities (487,070) (516,895) (63,158)
Proceeds from borrowings 180,000 400,500 419,183
Payment of long-term debt and notes payable 30,000 (215,000) (413,644)
Proceeds from exercise of stock options 8,983 15,912 15,815
Common stock offering 15,225 0 0
Common stock repurchases 19,779 (12,741) (7,809)
Debt issue costs 3,589 (3,623) (9,242)
Contributions from noncontrolling interest 8,069 1,092 813
Purchase of noncontrolling interest 0 (14,429) 0
Excess tax benefits from stock compensation 6,380 10,996 4,435
Net cash provided by financing activities 165,289 182,707 9,551
Net (decrease) increase in cash and cash equivalents (19,539) (6,248) 19,147
Cash and cash equivalents, beginning of period 22,279 28,527 9,380
Cash and cash equivalents, end of period $ 2,740 $ 22,279 $ 28,527