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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net cash provided by (used in) operating activities $ 140,965 $ 152,639
Cash flows from investing activities:    
Proceeds from sale of property and equipment 15  
Purchases of property and equipment (2,757) (3,637)
Purchases of equity securities (13,275) (35,267)
Purchases of fixed maturities (67,517) (241,613)
Purchases of investment real estate, net (3,759) (2,074)
Proceeds from sales of equity securities 56,971 43,766
Proceeds from sales of fixed maturities 6,507 73,907
Maturities of fixed maturities 39,144 22,479
Maturities of short-term investments 5,000 25,000
Net cash provided by (used in) investing activities 20,329 (117,439)
Cash flows from financing activities:    
Preferred stock dividend (5) (5)
Common stock dividend (9,803) (4,915)
Purchase of treasury stock (8,919) (6,927)
Sale of treasury stock   2,965
Payments related to tax withholding for share-based compensation (1,367) (4,831)
Excess tax benefits (shortfall) from share-based compensation   (1,818)
Repayment of debt (1,435) (1,400)
Net cash provided by (used in) financing activities (21,529) (16,931)
Net increase (decrease) in cash and cash equivalents 139,765 18,269
Cash and cash equivalents at beginning of period 105,730 197,014
Cash and cash equivalents at end of period $ 245,495 $ 215,283