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Schedule II - Condensed Financial Information of Registrant (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating activities |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 33,776 | $ 97,306 | $ 82,845 | $ 5,903 | $ 31,217 | $ 67,815 | $ 36,744 | $ (9,753) | $ 219,830 | $ 126,023 | $ 253,283
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of 2015 notes embedded conversion derivative |  |  |  |  |  |  |  |  |  | (464,698) | 32,321 | 133,968
Change in fair value of derivatives |  |  |  |  |  |  |  |  |  | 334,300 | (506,328) | (1,076,015)
Loss on extinguishment of debt |  |  |  |  |  | 1,951 | $ 0 | $ 6,574 | 3,977 | 0 | 12,502 | 32,515
Share-based compensation |  |  |  |  |  |  |  |  |  | 7,373 | 3,544 | 10,476
ESOP compensation |  |  |  |  |  |  |  |  |  | 2,604 | 2,486 | 3,464
Deferred income taxes (benefits) |  |  |  |  |  |  |  |  |  | 41,916 | (46,504) | 3,013
Other |  |  |  |  |  |  |  |  |  | (15,962) | (8,948) | (7,059)
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  | 71 | (2,771) | 1,113
Other liabilities |  |  |  |  |  |  |  |  |  | 75,794 | (51,008) | (11,435)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 504,804 | 707,786 | 862,668
Investing activities |  |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (5,577,205) | (2,947,749) | (3,879,296)
Financing activities |  |  |  |  |  |  |  |  |  |  |  |
Financing fees incurred and deferred |  |  |  |  |  |  |  |  |  | 0 | (100) | (11,942)
Repayment of notes payable |  |  |  |  |  |  |  |  |  | (48,152) | (219,094) | (234,154)
Net proceeds from settlement of notes hedges and warrants |  |  |  |  |  |  |  |  |  | 25,775 | 16,558 | 22,170
Excess tax benefits realized from share-based compensation plans |  |  |  |  |  |  |  |  |  | 3,649 | 5,184 | 4,043
Proceeds from issuance of common stock | $ 104,500 |  |  |  |  |  |  |  |  | 112,481 | 13,681 | 31,764
Dividends paid |  |  |  |  |  |  |  |  |  | (17,874) | (15,015) | (12,643)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  | 4,768,636 | 2,043,948 | 2,645,612
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | (303,765) | (196,015) | (371,016)
Cash and cash equivalents at beginning of year |  |  |  |  | 701,514 |  |  |  | 897,529 | 701,514 | 897,529 | 1,268,545
Cash and cash equivalents at end of year |  | 397,749 |  |  |  | 701,514 |  |  |  | 397,749 | 701,514 | 897,529
Cash paid during the year for interest: |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  | 39,118 | 42,989 | 25,608
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Operating activities |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 219,830 | 126,023 | 253,283
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of 2015 notes embedded conversion derivative |  |  |  |  |  |  |  |  |  | (4,516) | (15,227) | 141,974
Provision for depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,613 | 2,081 | 2,831
Accrual of discount on equity security |  |  |  |  |  |  |  |  |  | (6) | (6) | (5)
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  | (209,698) | (134,890) | (279,961)
Accrual of discount on contingent convertible notes |  |  |  |  |  |  |  |  |  | 698 | 4,417 | 12,417
Change in fair value of derivatives |  |  |  |  |  |  |  |  |  | 6,377 | 15,619 | (144,012)
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  | 0 | 12,502 | 32,515
Accrual of discount on debenture issued to subsidiary trust |  |  |  |  |  |  |  |  |  | 207 | 193 | 181
Share-based compensation |  |  |  |  |  |  |  |  |  | 1,026 | 1,141 | 1,407
ESOP compensation |  |  |  |  |  |  |  |  |  | 0 | 82 | 110
Deferred income taxes (benefits) |  |  |  |  |  |  |  |  |  | 8,967 | 6,439 | (5,202)
Other |  |  |  |  |  |  |  |  |  | 0 | (2,235) | (3,608)
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Receivable from subsidiaries |  |  |  |  |  |  |  |  |  | 93 | 2,208 | 995
Federal income tax recoverable |  |  |  |  |  |  |  |  |  | 2,683 | 1,121 | 62
Other assets |  |  |  |  |  |  |  |  |  | (4) | 378 | (1,945)
Other liabilities |  |  |  |  |  |  |  |  |  | (1,664) | (7,256) | 20,131
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 25,606 | 12,590 | 31,173
Investing activities |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions to subsidiaries |  |  |  |  |  |  |  |  |  | (120,000) | 0 | 0
Net cash used in investing activities |  |  |  |  |  |  |  |  |  | (120,000) | 0 | 0
Financing activities |  |  |  |  |  |  |  |  |  |  |  |
Financing fees incurred and deferred |  |  |  |  |  |  |  |  |  | 0 | (100) | (11,942)
Proceeds from notes payable |  |  |  |  |  |  |  |  |  | 0 | 0 | 415,000
Repayment of notes payable |  |  |  |  |  |  |  |  |  | (48,152) | (219,094) | (234,154)
Net proceeds from settlement of notes hedges and warrants |  |  |  |  |  |  |  |  |  | 25,775 | 16,558 | 22,170
Excess tax benefits realized from share-based compensation plans |  |  |  |  |  |  |  |  |  | 0 | 184 | 159
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  | 112,481 | 13,681 | 31,764
Dividends paid |  |  |  |  |  |  |  |  |  | (17,946) | (15,221) | (12,849)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  | 72,158 | (203,992) | 210,148
Increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  | (22,236) | (191,402) | 241,321
Cash and cash equivalents at beginning of year |  |  |  |  | $ 61,139 |  |  |  | $ 252,541 | 61,139 | 252,541 | 11,220
Cash and cash equivalents at end of year |  | $ 38,903 |  |  |  | $ 61,139 |  |  |  | 38,903 | 61,139 | 252,541
Parent Company [Member] | Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid during the year for interest: |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  | 27,283 | 31,206 | 13,758
Parent Company [Member] | Convertible Subordinated Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |
Cash paid during the year for interest: |  |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  |  |  |  |  |  | 11,833 | 11,765 | 11,850
Common Stock Issued in Extinguishment of Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash financing activity: |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 0 | 95,993 | 117,463
Common Stock Issued in Extinguishment of Debt [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash financing activity: |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 0 | 95,993 | 117,463
Common Stock Issued to Settle Warrants That Have Expired [Member] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash financing activity: |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | 48 | 0 | 0
Common Stock Issued to Settle Warrants That Have Expired [Member] | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash financing activity: |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  | $ 48 | $ 0 | $ 0

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- Definition The increase (decrease) during the reporting period in other assets used in operating activities less other operating liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets and liabilities, other noncurrent assets and liabilities, or a combination of other current and noncurrent assets and liabilities. + 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=56944662&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in other liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current liabilities, other noncurrent liabilities, or a combination of other current and noncurrent liabilities. + 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=56944662&loc=d3e3602-108585 + 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=56944662&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=56944662&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=56944662&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=56944662&loc=d3e3574-108585 + 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=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: 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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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