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Schedule II - Condensed Financial Information of Registrant (Condensed Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities      
Net income $ 473,992 $ 671,460 $ 246,090
Adjustments to reconcile net income to net cash provided by operating activities:      
Accrual of discount on equity security 19,861 57,437 25,846
Change in fair value of derivatives (1,348,704) (34,668) (906,201)
Loss on extinguishment of debt 0 2,024 2,001
Share-based compensation 24,601 10,215 11,295
Deferred income taxes 128,423 141,071 56,947
Changes in operating assets and liabilities:      
Other assets (4,464) (849) (5,607)
Other liabilities (221,726) 38,995 (28,607)
Net cash provided by operating activities 4,233,164 1,304,986 3,351,402
Investing activities      
Purchases of property, plant and equipment (18,109) (13,240) (4,022)
Net cash provided by (used in) investing activities (6,224,307) 5,134,604 (3,054,886)
Financing activities      
Repayment of subordinated debentures 0 (81,450) (88,160)
Proceeds from issuance of common stock, net 4,854 338,061 1,691
Acquisition of treasury stock (99,415) (165,094) 0
Proceeds from issuance of preferred stock, net 0 290,260 388,893
Dividends paid on common stock (31,450) (28,859) (27,304)
Dividends paid on preferred stock (43,675) (33,515) 0
Net cash provided by (used in) financing activities (2,595,397) 362,540 1,652,480
Increase (decrease) in cash and cash equivalents (4,586,540) 6,802,130 1,948,996
Cash and cash equivalents at beginning of year 9,095,522 2,293,392 344,396
Cash and cash equivalents at end of year 4,508,982 9,095,522 2,293,392
Cash paid during the year for interest:      
Interest paid 30,000 31,427 42,879
Parent Company      
Operating activities      
Net income 473,992 671,460 246,090
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for depreciation and amortization 1,232 1,138 1,136
Accrual of discount on equity security (10) (3) (8)
Equity in undistributed income of subsidiaries (199,390) (644,423) (216,724)
Non cash dividend from subsidiaries (80,000) 0 0
Change in fair value of derivatives 0 (62) 945
Loss on extinguishment of debt 0 2,024 2,001
Accrual of discount on debenture issued to subsidiary trust 309 289 270
Share-based compensation 10,235 3,303 2,923
Deferred income taxes 222,714 6,408 2,087
Changes in operating assets and liabilities:      
Receivable from subsidiaries (365) (1,208) (40)
Federal income tax recoverable/payable (222,569) (3,879) 382
Other assets (5,054) (320) (1,229)
Other liabilities 21,819 7,617 (1,846)
Net cash provided by operating activities 222,913 42,344 35,987
Investing activities      
Notes receivable from subsidiaries (165,000) 0 0
Repayment of equity securities 0 2,445 2,660
Contribution to subsidiaries 0 (210,000) (50,000)
Purchases of property, plant and equipment (12,642) (48) (117)
Net cash provided by (used in) investing activities (177,642) (207,603) (47,457)
Financing activities      
Repayment of subordinated debentures 0 (81,450) (88,160)
Proceeds from issuance of common stock, net 4,844 338,061 1,691
Acquisition of treasury stock (99,415) (165,094) 0
Proceeds from issuance of preferred stock, net 0 290,260 388,893
Dividends paid on common stock (31,450) (28,859) (27,304)
Dividends paid on preferred stock (43,675) (33,515) 0
Net cash provided by (used in) financing activities (169,696) 319,403 275,120
Increase (decrease) in cash and cash equivalents (124,425) 154,144 263,650
Cash and cash equivalents at beginning of year 486,670 332,526 68,876
Cash and cash equivalents at end of year 362,245 486,670 332,526
Parent Company | Notes Payable      
Cash paid during the year for interest:      
Interest paid 25,000 25,000 25,000
Parent Company | Subordinated Debentures      
Cash paid during the year for interest:      
Interest paid $ 5,000 $ 6,181 $ 16,891