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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net cash provided by (used in) operating activities $ 71,998 $ 43,737
Cash flows from investing activities:    
Proceeds from sale of property and equipment 8  
Purchases of property and equipment (1,255) (1,728)
Purchases of equity securities (243) (20,178)
Purchases of fixed maturities (26,610) (95,889)
Purchases of investment real estate, net (1,714) (2,021)
Proceeds from sales of equity securities 2,500 13,210
Proceeds from sales of fixed maturities 914 16,152
Proceeds from sales of short-term investments   12,500
Maturities of fixed maturities 18,915 10,504
Net cash provided by (used in) investing activities (7,485) (67,450)
Cash flows from financing activities:    
Preferred stock dividend (3) (3)
Common stock dividend (4,924) (4,915)
Purchase of treasury stock (2,548) (1,874)
Payments related to tax withholding for share-based compensation (1,337) (3,897)
Excess tax benefits (shortfall) from share-based compensation   (1,510)
Repayment of debt (1,067) (1,068)
Net cash provided by (used in) financing activities (9,879) (13,267)
Net increase (decrease) in cash and cash equivalents 54,634 (36,980)
Cash and cash equivalents at beginning of period 105,730 197,014
Cash and cash equivalents at end of period $ 160,364 $ 160,034