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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net cash provided by (used in) operating activities $ 286,195 $ 178,637
Cash flows from investing activities:    
Proceeds from sale of property and equipment 17 31
Purchases of property and equipment (3,655) (6,041)
Purchases of equity securities (47,070) (46,414)
Purchases of fixed maturities (114,593) (278,961)
Purchases of investment real estate, net (5,023) (4,400)
Proceeds from sales of equity securities 75,027 46,819
Proceeds from sales of fixed maturities 19,643 78,966
Maturities of fixed maturities 75,770 38,111
Maturities of short-term investments 5,000 25,000
Net cash provided by (used in) investing activities 5,116 (146,889)
Cash flows from financing activities:    
Preferred stock dividend (8) (7)
Common stock dividend (9,803) (9,828)
Purchase of treasury stock (17,884) (8,415)
Sale of treasury stock   2,965
Payments related to tax withholding for share-based compensation (1,367) (4,905)
Excess tax benefits (shortfall) from share-based compensation   (1,563)
Repayment of debt (1,803) (1,768)
Net cash provided by (used in) financing activities (30,865) (23,521)
Net increase (decrease) in cash and cash equivalents 260,446 8,227
Cash and cash equivalents at beginning of period 105,730 197,014
Cash and cash equivalents at end of period $ 366,176 $ 205,241