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Schedule II Financial Information of Registrant Parent Company Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:                      
Net income $ 6,816 [1] $ 65,142 $ (27,342) $ 76,472 $ 61,089 $ 82,803 $ 98,112 $ 66,249 $ 121,088 $ 308,253 $ 286,924
Less: Income (loss) from discontinued operations, net of tax                 0 0 5,385
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Net (gains) losses on investments and other financial instruments 1,339 (2,480) (5,331) 2,851 38,773 (7,711) (30,527) (31,286) (3,621) (30,751) (35,693)
Loss on induced conversion and debt extinguishment (Note 12) 0 $ 45,766 $ 1,247 4,456 0 $ 17,397 $ 2,108 55,570 51,469 75,075 94,207
Deferred income tax provision                 166,527 170,887 156,170
Change in other assets                 (16,491) (7,662) 7,799
Change in other liabilities                 4,405 57,136 (66,786)
Net cash provided by (used in) operating activities, continuing operations                 360,575 381,724 13,480
Net cash provided by (used in) operating activities, discontinued operations                 0 0 (1,759)
Net cash (used in) provided by operating activities                 360,575 381,724 11,721
Cash flows from investing activities:                      
Proceeds from Sale and Maturity of Available-for-sale Securities                 888,219 687,173 20,100
Proceeds from Sale of Available-for-sale Securities, Equity                 38,318 74,868 146,049
Proceeds from Sale of Trading Securities Held-for-investment                 194,784 290,855 78,826
Proceeds from redemptions of fixed-maturity investments available for sale                 463,548 337,630 103,595
Proceeds from redemptions of fixed-maturity investments held to maturity                 79,296 123,645 221,914
Purchases of Available-for-sale Securities                 (1,947,916) (1,990,652) (1,486,318)
Purchases of equity securities available for sale                 (213,469) (830) (75,538)
Sales, redemptions and (purchases) of short-term investments, net                 324,258 334,456 222,882
Sales, redemptions and (purchases) of other assets and other invested assets, net                 882 2,489 16,717
Payments to Acquire Businesses, Net of Cash Acquired                 (86) (150) (9,834)
Net cash provided by (used in) investing activities                 (201,492) (176,058) 2,792
Cash flows from financing activities:                      
Dividends paid                 (2,154) (2,105) (1,996)
Issuance of long-term debt, net                 442,163 343,417 343,334
Purchases and redemptions of long-term debt                 (593,527) (445,072) (156,172)
Proceeds from Hedge, Financing Activities                 4,208 0 13,150
Issuance of common stock                 7,132 717 1,285
Purchase of common shares                 (6) (100,188) (202,000)
Excess tax benefits from stock-based awards (Note 2)                 0 333 3,000
Net cash provided by (used in) financing activities                 (125,084) (203,269) 601
Cash and Restricted Cash, Period Increase (Decrease) Including Discontinued Operations                 34,430 1,916 14,981
Cash and restricted cash, beginning of period       61,814       59,898 61,814 59,898 44,496
Cash and restricted cash, end of period 96,244       61,814       96,244 61,814 59,898
Parent Company [Member]                      
Cash flows from operating activities:                      
Net income                 121,088 308,253 286,924
Less: Income (loss) from discontinued operations, net of tax                 0 0 204
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Loss on induced conversion and debt extinguishment (Note 12)                 (51,469) (75,075) (94,207)
Net cash provided by (used in) operating activities, continuing operations                 (23,654) 38,902 (128,879)
Net cash provided by (used in) operating activities, discontinued operations                 0 0 0
Net cash (used in) provided by operating activities                 (23,654) 38,902 (128,879)
Cash flows from investing activities:                      
Proceeds from Sale and Maturity of Available-for-sale Securities                 58,007 47,058 0
Proceeds from Sale of Available-for-sale Securities, Equity                 0 24,992 0
Proceeds from Sale of Trading Securities Held-for-investment                 0 30,350 0
Proceeds from redemptions of fixed-maturity investments available for sale                 60,414 49,578 0
Proceeds from redemptions of fixed-maturity investments held to maturity                 0 10,000 0
Purchases of Available-for-sale Securities                 (134,456) (137,431) (39,667)
Purchases of equity securities available for sale                 0 0 25,545
Sales, redemptions and (purchases) of short-term investments, net                 210,529 (40,288) 473,350
Payments for (Proceeds from) Productive Assets                 (1,107) 239 (688)
Proceeds from Contributions from Affiliates                 924 15,000 113,784
Capital contributions to subsidiaries and affiliates                 (21,643) (1,500) (182,307)
Payments to Acquire Businesses, Net of Cash Acquired                 0 (30,443) 0
Issuance of notes receivable from affiliates                 (44) 201,631 208,527
Net cash provided by (used in) investing activities                 172,624 169,186 130,400
Cash flows from financing activities:                      
Dividends paid                 (2,154) (2,105) (1,996)
Issuance of long-term debt, net                 442,163 343,417 343,334
Purchases and redemptions of long-term debt                 (593,527) (445,072) (156,172)
Proceeds from Hedge, Financing Activities                 4,208 0 13,150
Issuance of common stock                 7,132 717 1,285
Purchase of common shares                 (6) (100,188) (202,000)
Credit facility commitment fees paid                 (1,993) 0 0
Excess tax benefits from stock-based awards (Note 2)                 0 98 2,228
Net cash provided by (used in) financing activities                 (144,177) (203,133) (171)
Cash and Restricted Cash, Period Increase (Decrease) Including Discontinued Operations                 4,793 4,955 1,350
Cash and restricted cash, beginning of period       $ 8,380       $ 3,425 8,380 3,425 2,075
Cash and restricted cash, end of period $ 13,173       $ 8,380       $ 13,173 $ 8,380 $ 3,425
[1] The fourth quarter of 2017 reflects an incremental tax provision related to the remeasurement of our net deferred tax assets as a result of the enactment of the TCJA.