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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Statement Of Cash Flows [Abstract]    
Cash flows from operating activities $ 152,639 $ 207,547
Cash flows from investing activities:    
Proceeds from sale of property and equipment   51
Purchases of property and equipment (3,637) (7,414)
Payments to acquire a business   (1,000)
Purchases of equity securities (35,267) (36,522)
Purchases of fixed maturities (241,613) (73,320)
Purchases of short-term investments   (87,542)
Purchases of investment real estate, net (2,074) (5,882)
Proceeds from sales of equity securities 43,766 17,412
Proceeds from sales of fixed maturities 73,907 14,140
Proceeds from sales of short-term investments   12,500
Maturities of fixed maturities 22,479 53,344
Maturities of short-term investments 25,000 25,009
Net cash provided by (used in) investing activities (117,439) (89,224)
Cash flows from financing activities:    
Preferred stock dividend (5) (5)
Common stock dividend (4,915) (4,237)
Issuance of common stock   504
Purchase of treasury stock (6,927) (5,076)
Sale of treasury stock 2,965  
Purchase of preferred stock   (257)
Payments related to tax withholding for share-based compensation (4,831) (9,791)
Excess tax benefits (shortfall) from share-based compensation (1,818) 4,817
Borrowings under promissory note   1,390
Repayment of debt (1,400) (7,735)
Net cash provided by (used in) financing activities (16,931) (20,390)
Net increase (decrease) in cash and cash equivalents 18,269 97,933
Cash and cash equivalents at beginning of period 197,014 115,397
Cash and cash equivalents at end of period 215,283 213,330
Supplemental cash and non-cash flow disclosures:    
Interest paid 303 567
Income taxes paid 35,781 $ 33,279
Income tax refund $ 5,694