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Schedule II - Condensed Financial Information of Registrant (Condensed Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Aug. 01, 2016
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities                        
Net income   $ 53,823 $ 169,328 $ 93,903 $ 140,962 $ 36,803 $ 56,957 $ 26,946 $ 53,939 $ 458,016 $ 174,645 $ 83,243
Adjustments to reconcile net income to net cash provided by operating activities:                        
Accrual of discount on equity security                   19,204 15,431 1,070
Change in fair value of derivatives                   777,575 (1,678,956) (165,727)
Loss on extinguishment of debt           0 $ 18,389 $ 428 0 0 18,817 0
Share-based compensation                   11,097 6,464 6,692
Deferred income taxes                   (12,563) (46,730) (10,408)
Changes in operating assets and liabilities:                        
Other assets                   (844) 448 1,812
Other liabilities                   (17,318) (84,416) (55,940)
Net cash provided by operating activities                   43,185 1,923,847 1,416,386
Investing activities                        
Purchases of property, plant and equipment                   (4,283) (4,809) (1,197)
Net cash used in investing activities                   (2,408,331) (2,593,390) (4,501,109)
Financing activities                        
Financing fees incurred and deferred                   0 (5,817) (1,456)
Repayment of notes payable                   0 (413,252) 0
Repayment of loan payable                   0 (100,000) 0
Proceeds from issuance of notes payable                   0 499,650 0
Proceeds from issuance of loan payable                   0 0 100,000
Proceeds from issuance of common stock $ 134,700                 9,681 14,028 139,654
Dividends paid                   (25,265) (23,148) (21,110)
Net cash provided by (used in) financing activities                   1,275,497 1,312,322 3,478,240
Increase (decrease) in cash and cash equivalents                   (1,089,649) 642,779 393,517
Cash and cash equivalents at beginning of year         1,434,045       791,266 1,434,045 791,266 397,749
Cash and cash equivalents at end of year   344,396       1,434,045       344,396 1,434,045 791,266
Cash paid during the year for interest:                        
Interest paid                   39,575 55,445 39,647
Non-cash financing activity:                        
Common stock issued to settle warrants that have expired                   0 0 93
Parent Company                        
Operating activities                        
Net income                   458,016 174,645 83,243
Adjustments to reconcile net income to net cash provided by operating activities:                        
Provision for depreciation and amortization                   916 1,610 1,946
Accrual of discount on equity security                   (8) (7) (7)
Equity in undistributed income of subsidiaries                   (411,094) (165,572) (65,635)
Change in fair value of derivatives                   (1,325) (657) (698)
Loss on extinguishment of debt                   0 18,817 0
Accrual of discount on debenture issued to subsidiary trust                   254 236 221
Share-based compensation                   1,626 951 818
Deferred income taxes                   40 1,583 2,117
Changes in operating assets and liabilities:                        
Receivable from subsidiaries                   (1,004) 16 (125)
Federal income tax recoverable/payable                   9,951 (4,673) 11,361
Other assets                   (229) 158 (326)
Other liabilities                   4,860 (12,427) 2,546
Net cash provided by operating activities                   62,003 14,680 35,461
Investing activities                        
Capital contributions to subsidiaries                   0 0 (255,000)
Purchases of property, plant and equipment                   (29) (45) (54)
Net cash used in investing activities                   (29) (45) (255,054)
Financing activities                        
Financing fees incurred and deferred                   0 (5,817) (1,456)
Repayment of notes payable                   0 (413,252) 0
Repayment of loan payable                   0 (100,000) 0
Proceeds from issuance of notes payable                   0 499,650 0
Proceeds from issuance of loan payable                   0 0 100,000
Proceeds from issuance of common stock                   9,681 14,028 139,654
Dividends paid                   (25,265) (23,152) (21,114)
Net cash provided by (used in) financing activities                   (15,584) (28,543) 217,084
Increase (decrease) in cash and cash equivalents                   46,390 (13,908) (2,509)
Cash and cash equivalents at beginning of year         $ 22,486       $ 36,394 22,486 36,394 38,903
Cash and cash equivalents at end of year   $ 68,876       $ 22,486       68,876 22,486 36,394
Non-cash financing activity:                        
Common stock issued to settle warrants that have expired                   0 0 93
Parent Company | Notes and Loans Payable                        
Cash paid during the year for interest:                        
Interest paid                   25,000 40,537 27,164
Parent Company | Subordinated Debentures                        
Cash paid during the year for interest:                        
Interest paid                   $ 13,593 $ 14,573 $ 12,454