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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, 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 2,674   2,674    
Issuance of common stock under compensation plans 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
Stockholders' equity at beginning of period at Dec. 31, 2016 2,291,595 88,001 770,344 339,966 1,093,284
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 53,939       53,939
Other comprehensive income 84,577     84,577  
Share-based compensation 2,403   2,403    
Issuance of common stock under compensation plans 3,717 630 3,087    
Stockholders' equity at end of period at Mar. 31, 2017 $ 2,436,231 $ 88,631 $ 775,834 $ 424,543 $ 1,147,223