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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) (37,553)       (37,553)
Other comprehensive income 762,133     762,133  
Share-based compensation 5,335   5,335    
Issuance of common stock via settlement of forward sale agreements 134,662 5,590 129,072    
Issuance of common stock under compensation plans 3,751 861 2,890    
Issuance of common stock to settle warrants that have reached their expiration (1) 93 (94)    
Stockholders' equity at end of period at Sep. 30, 2016 2,812,862 87,898 767,570 963,796 993,598
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) 137,842       137,842
Other comprehensive income 319,525     319,525  
Share-based compensation 5,414   5,414    
Issuance of common stock under compensation plans 8,291 933 7,358    
Stockholders' equity at end of period at Sep. 30, 2017 $ 2,762,667 $ 88,934 $ 783,116 $ 659,491 $ 1,231,126