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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income [Member]
Retained Earnings [Member]
Stockholders' equity at beginning of period at Dec. 31, 2014 $ 2,139,876 $ 76,062 $ 513,218 $ 721,401 $ 829,195
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 5,903       5,903
Other comprehensive income 172,337     172,337  
Share-based compensation, including excess income tax benefits 4,515   4,515    
Issuance of common stock under compensation plans, including excess income tax benefits 4,089 619 3,470    
Stockholders' equity at end of period at Mar. 31, 2015 2,326,720 76,681 521,203 893,738 835,098
Stockholders' equity at beginning of period at Dec. 31, 2015 1,944,535 81,354 630,367 201,663 1,031,151
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) (44,841)       (44,841)
Other comprehensive income 328,456     328,456  
Share-based compensation, including excess income tax benefits 2,674   2,674    
Issuance of common stock under compensation plans, including excess income tax benefits 3,492 721 2,771    
Issuance of common stock to settle warrants that have reached their expiration 0 80 (80)    
Stockholders' equity at end of period at Mar. 31, 2016 $ 2,234,316 $ 82,155 $ 635,732 $ 530,119 $ 986,310