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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
--- | --- | --- | ---
Nov. 21, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 220,150 | $ 37,360 | $ 18,590 | $ (30,010) | $ 53,823 | $ 169,328 | $ 93,903 | $ 140,962 | $ 246,090 | $ 458,016 | $ 174,645
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Accrual of discount on equity security |  |  |  |  |  |  |  |  |  | 25,846 | 19,204 | 15,431
Change in fair value of derivatives |  |  |  |  |  |  |  |  |  | (906,201) | 777,575 | (1,678,956)
Loss on extinguishment of debt |  | 2,001 | $ 0 | $ 0 | 0 |  |  |  |  | 2,001 | 0 | 18,817
Share-based compensation |  |  |  |  |  |  |  |  |  | 11,295 | 11,097 | 6,464
Deferred income taxes |  |  |  |  |  |  |  |  |  | 56,947 | (12,563) | (46,730)
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  | (5,607) | (844) | 448
Other liabilities |  |  |  |  |  |  |  |  |  | (28,607) | (17,318) | (84,416)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 3,351,402 | 43,185 | 1,923,847
Investing activities |  |  |  |  |  |  |  |  |  |  |  |
Purchases of property, plant and equipment |  |  |  |  |  |  |  |  |  | (4,022) | (4,283) | (4,809)
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (3,054,886) | (2,408,331) | (2,593,390)
Financing activities |  |  |  |  |  |  |  |  |  |  |  |
Financing fees incurred and deferred |  |  |  |  |  |  |  |  |  | 0 | 0 | (5,817)
Repayment of notes payable |  |  |  |  |  |  |  |  |  | 0 | 0 | (413,252)
Repayment of loan payable |  |  |  |  |  |  |  |  |  | 0 | 0 | (100,000)
Proceeds from issuance of notes payable |  |  |  |  |  |  |  |  |  | 0 | 0 | 499,650
Repayment of subordinated debentures |  |  |  |  |  |  |  |  |  | (88,160) | 0 | 0
Proceeds from issuance of common stock, net |  |  |  |  |  |  |  |  |  | 1,691 | 9,681 | 14,028
Proceeds from issuance of preferred stock, net | $ 388,900 |  |  |  |  |  |  |  |  | 388,893 | 0 | 0
Dividends paid |  |  |  |  |  |  |  |  |  | (27,304) | (25,265) | (23,148)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  | 1,652,480 | 1,275,497 | 1,312,322
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 1,948,996 | (1,089,649) | 642,779
Cash and cash equivalents at beginning of year |  |  |  |  | 344,396 |  |  |  | 1,434,045 | 344,396 | 1,434,045 | 791,266
Cash and cash equivalents at end of year |  | 2,293,392 |  |  |  | 344,396 |  |  |  | 2,293,392 | 344,396 | 1,434,045
Cash paid during the year for interest: |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  | 42,879 | 39,575 | 55,445
Parent Company |  |  |  |  |  |  |  |  |  |  |  |
Operating activities |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 246,090 | 458,016 | 174,645
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Provision for depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,136 | 916 | 1,610
Accrual of discount on equity security |  |  |  |  |  |  |  |  |  | (8) | (8) | (7)
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  | (216,724) | (411,094) | (165,572)
Change in fair value of derivatives |  |  |  |  |  |  |  |  |  | 945 | (1,325) | (657)
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  | 2,001 | 0 | 18,817
Accrual of discount on debenture issued to subsidiary trust |  |  |  |  |  |  |  |  |  | 270 | 254 | 236
Share-based compensation |  |  |  |  |  |  |  |  |  | 2,923 | 1,626 | 951
Deferred income taxes |  |  |  |  |  |  |  |  |  | 2,087 | 40 | 1,583
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Receivable from subsidiaries |  |  |  |  |  |  |  |  |  | (40) | (1,004) | 16
Federal income tax recoverable/payable |  |  |  |  |  |  |  |  |  | 382 | 9,951 | (4,673)
Other assets |  |  |  |  |  |  |  |  |  | (1,229) | (229) | 158
Other liabilities |  |  |  |  |  |  |  |  |  | (1,846) | 4,860 | (12,427)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 35,987 | 62,003 | 14,680
Investing activities |  |  |  |  |  |  |  |  |  |  |  |
Repayment of equity securities |  |  |  |  |  |  |  |  |  | 2,660 | 0 | 0
Contribution to subsidiary |  |  |  |  |  |  |  |  |  | (50,000) | 0 | 0
Purchases of property, plant and equipment |  |  |  |  |  |  |  |  |  | (117) | (29) | (45)
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (47,457) | (29) | (45)
Financing activities |  |  |  |  |  |  |  |  |  |  |  |
Financing fees incurred and deferred |  |  |  |  |  |  |  |  |  | 0 | 0 | (5,817)
Repayment of notes payable |  |  |  |  |  |  |  |  |  | 0 | 0 | (413,252)
Repayment of loan payable |  |  |  |  |  |  |  |  |  | 0 | 0 | (100,000)
Proceeds from issuance of notes payable |  |  |  |  |  |  |  |  |  | 0 | 0 | 499,650
Repayment of subordinated debentures |  |  |  |  |  |  |  |  |  | (88,160) | 0 | 0
Proceeds from issuance of common stock, net |  |  |  |  |  |  |  |  |  | 1,691 | 9,681 | 14,028
Proceeds from issuance of preferred stock, net |  |  |  |  |  |  |  |  |  | 388,893 | 0 | 0
Dividends paid |  |  |  |  |  |  |  |  |  | (27,304) | (25,265) | (23,152)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  | 275,120 | (15,584) | (28,543)
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 263,650 | 46,390 | (13,908)
Cash and cash equivalents at beginning of year |  |  |  |  | $ 68,876 |  |  |  | $ 22,486 | 68,876 | 22,486 | 36,394
Cash and cash equivalents at end of year |  | $ 332,526 |  |  |  | $ 68,876 |  |  |  | 332,526 | 68,876 | 22,486
Parent Company | Notes and Loan Payable |  |  |  |  |  |  |  |  |  |  |  |
Cash paid during the year for interest: |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  | 25,000 | 25,000 | 40,537
Parent Company | Subordinated Debentures |  |  |  |  |  |  |  |  |  |  |  |
Cash paid during the year for interest: |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  | $ 16,891 | $ 13,593 | $ 14,573

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