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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) (30,133)       (30,133)
Other comprehensive income 691,569     691,569  
Share-based compensation 3,889   3,889    
Issuance of common stock under compensation plans 3,531 832 2,699    
Issuance of common stock to settle warrants that have reached their expiration (1) 93 (94)    
Stockholders' equity at end of period at Jun. 30, 2016 2,613,390 82,279 636,861 893,232 1,001,018
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) 80,885       80,885
Other comprehensive income 270,156     270,156  
Share-based compensation 4,154   4,154    
Issuance of common stock under compensation plans 4,618 740 3,878    
Stockholders' equity at end of period at Jun. 30, 2017 $ 2,651,408 $ 88,741 $ 778,376 $ 610,122 $ 1,174,169