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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, 2012 $ 1,720,237 $ 61,751 $ 496,715 $ (2,583) $ 686,807 $ 477,547
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 146,144         146,144
Other comprehensive income (loss) (442,527)       (442,527)  
Allocation of common stock by ESOP, including excess income tax benefits 708   134 574    
Share-based compensation, including excess income tax benefits 3,193   3,193      
Issuance of common stock under compensation plans, including excess income tax benefits 12,557 1,533 11,024      
Extinguishment of convertible senior notes, net of tax, including shares of common stock issued upon conversion 1,764 217 1,547      
Stockholders' equity at end of period at Jun. 30, 2013 1,442,076 63,501 512,613 (2,009) 244,280 623,691
Stockholders' equity at beginning of period at Dec. 31, 2013 1,384,687 70,535 550,400 (631) 46,196 718,187
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 26,991         26,991
Other comprehensive income (loss) 509,875       509,875  
Allocation of common stock by ESOP, including excess income tax benefits 1,352   721 631    
Share-based compensation, including excess income tax benefits 3,607   3,607      
Issuance of common stock under compensation plans, including excess income tax benefits 8,830 1,110 7,720      
Extinguishment of convertible senior notes, net of tax, including shares of common stock issued upon conversion 8,923 2,444 6,479      
Warrants to be settled in cash (30,455)   (30,455)      
Stockholders' equity at end of period at Jun. 30, 2014 $ 1,913,810 $ 74,089 $ 538,472 $ 0 $ 556,071 $ 745,178