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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

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