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Schedule II - Condensed Financial Information of Registrant (Condensed Statements of Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues                      
Net investment income                 $ 108,660 $ 125,557 $ 129,265
Other income (loss)                 7,227 8,398 7,551
Total revenues                 772,079 852,326 740,178
Expenses                      
Interest expense                 14,596 14,084 2,755
Total expenses                 643,224 590,321 375,333
Income tax expense (benefit)                 12,658 65,440 99,636
Net income $ 34,948 $ 10,276 $ 33,158 $ 37,814 $ 65,114 $ 34,778 $ 49,942 $ 46,731 116,197 196,565 297,523
Other comprehensive income                 (34,349) (1,457) (85,719)
Comprehensive income                 81,848 195,108 211,804
Parent Company [Member]                      
Revenues                      
Net investment income                 5,017 3,295 5,789
Net realized investment gains (losses)                 4,673 990 5,334
Other income (loss)                 378 660 170
Total revenues                 10,068 4,945 11,293
Expenses                      
Interest expense                 14,596 14,084 2,747
Other expenses                 24,695 7,083 13,213
Total expenses                 39,291 21,167 15,960
Income (loss) before income tax expense (benefit) and equity in net income of consolidated subsidiaries                 (29,223) (16,222) (4,667)
Income tax expense (benefit)                 (11,657) (6,728) (1,007)
Income (loss) before equity in net income of consolidated subsidiaries                 (17,566) (9,494) (3,660)
Equity in net income of consolidated subsidiaries                 133,763 206,059 301,183
Net income                 116,197 196,565 297,523
Other comprehensive income                 (34,349) (1,457) (85,719)
Comprehensive income                 $ 81,848 $ 195,108 $ 211,804