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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
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 671,460 | $ 246,090 | $ 458,016
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Accrual of discount on equity security |  |  |  |  |  |  |  |  | 57,437 | 25,846 | 19,204
Change in fair value of derivatives |  |  |  |  |  |  |  |  | (34,668) | (906,201) | 777,575
Loss on extinguishment of debt | $ 0 | $ 0 | $ 0 | $ 2,024 | $ 2,001 | $ 0 | $ 0 | $ 0 | 2,024 | 2,001 | 0
Share-based compensation |  |  |  |  |  |  |  |  | 10,215 | 11,295 | 11,097
Deferred income taxes |  |  |  |  |  |  |  |  | 141,071 | 56,947 | (12,563)
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  | (849) | (5,607) | (844)
Other liabilities |  |  |  |  |  |  |  |  | 38,995 | (28,607) | (17,318)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 1,304,986 | 3,351,402 | 43,185
Investing activities |  |  |  |  |  |  |  |  |  |  |
Purchases of property, plant and equipment |  |  |  |  |  |  |  |  | (13,240) | (4,022) | (4,283)
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | 5,134,604 | (3,054,886) | (2,408,331)
Financing activities |  |  |  |  |  |  |  |  |  |  |
Repayment of subordinated debentures |  |  |  |  |  |  |  |  | (81,450) | (88,160) | 0
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 338,061 | 1,691 | 9,681
Acquisition of treasury stock |  |  |  |  |  |  |  |  | (165,094) | 0 | 0
Proceeds from issuance of preferred stock, net |  |  |  |  |  |  |  |  | 290,260 | 388,893 | 0
Dividends paid on common stock |  |  |  |  |  |  |  |  | (28,859) | (27,304) | (25,265)
Dividends paid on preferred stock |  |  |  |  |  |  |  |  | (33,515) | 0 | 0
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 362,540 | 1,652,480 | 1,275,497
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 6,802,130 | 1,948,996 | (1,089,649)
Cash and cash equivalents at beginning of year |  |  |  | 2,293,392 |  |  |  | 344,396 | 2,293,392 | 344,396 | 1,434,045
Cash and cash equivalents at end of year | 9,095,522 |  |  |  | 2,293,392 |  |  |  | 9,095,522 | 2,293,392 | 344,396
Cash paid during the year for interest: |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  | 31,427 | 42,879 | 39,575
Parent Company |  |  |  |  |  |  |  |  |  |  |
Operating activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 671,460 | 246,090 | 458,016
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Provision for depreciation and amortization |  |  |  |  |  |  |  |  | 1,138 | 1,136 | 916
Accrual of discount on equity security |  |  |  |  |  |  |  |  | (3) | (8) | (8)
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | (644,423) | (216,724) | (411,094)
Change in fair value of derivatives |  |  |  |  |  |  |  |  | (62) | 945 | (1,325)
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | 2,024 | 2,001 | 0
Accrual of discount on debenture issued to subsidiary trust |  |  |  |  |  |  |  |  | 289 | 270 | 254
Share-based compensation |  |  |  |  |  |  |  |  | 3,303 | 2,923 | 1,626
Deferred income taxes |  |  |  |  |  |  |  |  | 6,408 | 2,087 | 40
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Receivable from subsidiaries |  |  |  |  |  |  |  |  | (1,208) | (40) | (1,004)
Federal income tax recoverable/payable |  |  |  |  |  |  |  |  | (3,879) | 382 | 9,951
Other assets |  |  |  |  |  |  |  |  | (320) | (1,229) | (229)
Other liabilities |  |  |  |  |  |  |  |  | 7,617 | (1,846) | 4,860
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 42,344 | 35,987 | 62,003
Investing activities |  |  |  |  |  |  |  |  |  |  |
Repayment of equity securities |  |  |  |  |  |  |  |  | 2,445 | 2,660 | 0
Contribution to subsidiaries |  |  |  |  |  |  |  |  | (210,000) | (50,000) | 0
Purchases of property, plant and equipment |  |  |  |  |  |  |  |  | (48) | (117) | (29)
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | (207,603) | (47,457) | (29)
Financing activities |  |  |  |  |  |  |  |  |  |  |
Repayment of subordinated debentures |  |  |  |  |  |  |  |  | (81,450) | (88,160) | 0
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 338,061 | 1,691 | 9,681
Acquisition of treasury stock |  |  |  |  |  |  |  |  | (165,094) | 0 | 0
Proceeds from issuance of preferred stock, net |  |  |  |  |  |  |  |  | 290,260 | 388,893 | 0
Dividends paid on common stock |  |  |  |  |  |  |  |  | (28,859) | (27,304) | (25,265)
Dividends paid on preferred stock |  |  |  |  |  |  |  |  | (33,515) | 0 | 0
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 319,403 | 275,120 | (15,584)
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 154,144 | 263,650 | 46,390
Cash and cash equivalents at beginning of year |  |  |  | $ 332,526 |  |  |  | $ 68,876 | 332,526 | 68,876 | 22,486
Cash and cash equivalents at end of year | $ 486,670 |  |  |  | $ 332,526 |  |  |  | 486,670 | 332,526 | 68,876
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 |  |  |  |  |  |  |  |  | $ 6,181 | $ 16,891 | $ 13,593

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