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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating activities |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 120,796 | $ (7,420) | $ 14,708 | $ (44,841) | $ 33,776 | $ 97,306 | $ 82,845 | $ 5,903 | $ 83,243 | $ 219,830 | $ 126,023
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of 2015 notes embedded conversion derivative |  |  |  |  |  |  |  |  |  | 543,465 | (464,698) | 32,321
Change in fair value of derivatives |  |  |  |  |  |  |  |  |  | (165,727) | 334,300 | (506,328)
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  | 0 | 0 | 12,502
Share-based compensation |  |  |  |  |  |  |  |  |  | 6,692 | 7,373 | 3,544
ESOP compensation |  |  |  |  |  |  |  |  |  | 2,522 | 2,604 | 2,486
Deferred income taxes |  |  |  |  |  |  |  |  |  | (10,408) | 41,916 | (46,504)
Other |  |  |  |  |  |  |  |  |  | (14,089) | (15,962) | (8,948)
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  | 1,812 | 71 | (2,771)
Other liabilities |  |  |  |  |  |  |  |  |  | (55,940) | 75,794 | (51,008)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 1,414,322 | 504,804 | 707,786
Investing activities |  |  |  |  |  |  |  |  |  |  |  |
Purchases of property, plant and equipment |  |  |  |  |  |  |  |  |  | (1,197) | (1,313) | (1,352)
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (4,499,045) | (5,577,205) | (2,947,749)
Financing activities |  |  |  |  |  |  |  |  |  |  |  |
Financing fees incurred and deferred |  |  |  |  |  |  |  |  |  | (1,456) | 0 | (100)
Repayment of notes payable |  |  |  |  |  |  |  |  |  | 0 | (48,152) | (219,094)
Net proceeds from settlement of notes hedges and warrants |  |  |  |  |  |  |  |  |  | 0 | 25,775 | 16,558
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  | 100,000 | 0 | 0
Excess tax benefits realized from share-based compensation plans |  |  |  |  |  |  |  |  |  | 527 | 3,649 | 5,184
Proceeds from issuance of common stock | $ 134,700 |  |  |  |  |  |  |  |  | 139,654 | 112,481 | 13,681
Dividends paid |  |  |  |  |  |  |  |  |  | (21,110) | (17,874) | (15,015)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  | 3,478,240 | 4,768,636 | 2,043,948
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | 393,517 | (303,765) | (196,015)
Cash and cash equivalents at beginning of year |  |  |  |  | 397,749 |  |  |  | 701,514 | 397,749 | 701,514 | 897,529
Cash and cash equivalents at end of year |  | 791,266 |  |  |  | 397,749 |  |  |  | 791,266 | 397,749 | 701,514
Cash paid during the year for interest: |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  | 39,647 | 39,118 | 42,989
Common Stock Issued in Extinguishment of Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash financing activity: |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 0 | 0 | 95,993
Common Stock Issued to Settle Warrants That Have Expired [Member] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash financing activity: |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 93 | 48 | 0
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating activities |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 83,243 | 219,830 | 126,023
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of 2015 notes embedded conversion derivative |  |  |  |  |  |  |  |  |  | 0 | (4,516) | (15,227)
Provision for depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,946 | 1,613 | 2,081
Accrual of discount on equity security |  |  |  |  |  |  |  |  |  | (7) | (6) | (6)
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  | (65,635) | (209,698) | (134,890)
Accrual of discount on contingent convertible notes |  |  |  |  |  |  |  |  |  | 0 | 698 | 4,417
Change in fair value of derivatives |  |  |  |  |  |  |  |  |  | (698) | 6,377 | 15,619
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  | 0 | 0 | 12,502
Accrual of discount on debenture issued to subsidiary trust |  |  |  |  |  |  |  |  |  | 221 | 207 | 193
Share-based compensation |  |  |  |  |  |  |  |  |  | 818 | 1,026 | 1,141
ESOP compensation |  |  |  |  |  |  |  |  |  | 0 | 0 | 82
Deferred income taxes |  |  |  |  |  |  |  |  |  | 2,117 | 8,967 | 6,439
Other |  |  |  |  |  |  |  |  |  | 0 | 0 | (2,235)
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Receivable from subsidiaries |  |  |  |  |  |  |  |  |  | (125) | 93 | 2,208
Federal income tax recoverable |  |  |  |  |  |  |  |  |  | 11,361 | 2,683 | 1,121
Other assets |  |  |  |  |  |  |  |  |  | (326) | (4) | 378
Other liabilities |  |  |  |  |  |  |  |  |  | 2,546 | (1,664) | (7,256)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 35,461 | 25,606 | 12,590
Investing activities |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions to subsidiaries |  |  |  |  |  |  |  |  |  | (255,000) | (120,000) | 0
Purchases of property, plant and equipment |  |  |  |  |  |  |  |  |  | (54) | 0 | 0
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (255,054) | (120,000) | 0
Financing activities |  |  |  |  |  |  |  |  |  |  |  |
Financing fees incurred and deferred |  |  |  |  |  |  |  |  |  | (1,456) | 0 | (100)
Repayment of notes payable |  |  |  |  |  |  |  |  |  | 0 | (48,152) | (219,094)
Net proceeds from settlement of notes hedges and warrants |  |  |  |  |  |  |  |  |  | 0 | 25,775 | 16,558
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  | 100,000 | 0 | 0
Excess tax benefits realized from share-based compensation plans |  |  |  |  |  |  |  |  |  | 0 | 0 | 184
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  | 139,654 | 112,481 | 13,681
Dividends paid |  |  |  |  |  |  |  |  |  | (21,114) | (17,946) | (15,221)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  | 217,084 | 72,158 | (203,992)
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | (2,509) | (22,236) | (191,402)
Cash and cash equivalents at beginning of year |  |  |  |  | $ 38,903 |  |  |  | $ 61,139 | 38,903 | 61,139 | 252,541
Cash and cash equivalents at end of year |  | $ 36,394 |  |  |  | $ 38,903 |  |  |  | 36,394 | 38,903 | 61,139
Parent Company [Member] | Common Stock Issued in Extinguishment of Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash financing activity: |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 0 | 0 | 95,993
Parent Company [Member] | Common Stock Issued to Settle Warrants That Have Expired [Member] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash financing activity: |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 93 | 48 | 0
Parent Company [Member] | Notes and Loans Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid during the year for interest: |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  | 27,164 | 27,283 | 31,206
Parent Company [Member] | Subordinated Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid during the year for interest: |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  | $ 12,454 | $ 11,833 | $ 11,765

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- Definition Amount of increase (decrease) in operating liabilities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition The amount of cash paid for interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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