Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Unallocated Common Stock Held by ESOP [Member]	Accumulated Other Comprehensive Income [Member]	Retained Earnings [Member]
Stockholders' equity at beginning of period at Dec. 31, 2011	$ 1,408,679us-gaap_StockholdersEquity	$ 57,837	$ 468,281	$ (3,620)	$ 457,229	$ 428,952
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	57,798us-gaap_NetIncomeLoss					57,798
Other comprehensive income (loss)	229,578				229,578
Conversion of subordinated debentures	19,591	2,564	17,027
Allocation of common stock by ESOP, including excess income tax benefits	1,085		48	1,037
Share-based compensation, including excess income tax benefits	6,904		6,904
Issuance of common stock under compensation plans, including excess income tax benefits	5,805	1,350	4,455
Dividends on common stock	(9,203)us-gaap_DividendsCommonStockCash					(9,203)
Stockholders' equity at end of period at Dec. 31, 2012	1,720,237us-gaap_StockholdersEquity	61,751	496,715	(2,583)	686,807	477,547
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	253,283us-gaap_NetIncomeLoss					253,283
Other comprehensive income (loss)	(640,611)				(640,611)
Allocation of common stock by ESOP, including excess income tax benefits	3,390		1,438	1,952
Share-based compensation, including excess income tax benefits	13,624		13,624
Issuance of common stock under compensation plans, including excess income tax benefits	32,735	3,295	29,440
Extinguishment of convertible senior notes, net of tax, including shares of common stock issued upon conversion	62,663	5,489	57,174
Warrants reclassified to embedded derivative liability to be settled in cash	(47,991)		(47,991)
Dividends on common stock	(12,643)us-gaap_DividendsCommonStockCash					(12,643)
Stockholders' equity at end of period at Dec. 31, 2013	1,384,687us-gaap_StockholdersEquity	70,535	550,400	(631)	46,196	718,187
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	126,023us-gaap_NetIncomeLoss					126,023
Other comprehensive income (loss)	675,205				675,205
Allocation of common stock by ESOP, including excess income tax benefits	1,352		721	631
Share-based compensation, including excess income tax benefits	7,705		7,705
Issuance of common stock under compensation plans, including excess income tax benefits	14,705	1,568	13,137
Extinguishment of convertible senior notes, net of tax, including shares of common stock issued upon conversion	(3,529)	3,959	(7,488)
Warrants reclassified to embedded derivative liability to be settled in cash	(51,257)		(51,257)
Dividends on common stock	(15,015)us-gaap_DividendsCommonStockCash					(15,015)
Stockholders' equity at end of period at Dec. 31, 2014	$ 2,139,876us-gaap_StockholdersEquity	$ 76,062	$ 513,218	$ 0	$ 721,401	$ 829,195

Value of stock issued during the period as a result of stock awards and stock options exercised.

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Outstanding stock warrants that were originally issued with the intention to share settle if holder exercised before expiration, which resulted in the proceeds from the sale of the warrants to be recognized as equity. These warrants subsequently were assigned to a partial unwind agreement to be net cash settled, which required reclassification at fair value from equity to a derivative liability.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Aggregate value of stock issued during the period as a result of employee stock ownership plan (ESOP).

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