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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, 2016 $ 2,291,595 $ 88,001 $ 770,344 $ 339,966 $ 1,093,284
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 80,885       80,885
Other comprehensive income (loss) 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
Stockholders' equity at beginning of period at Dec. 31, 2017 2,850,157 89,331 791,446 724,599 1,244,781
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 234,865       234,865
Other comprehensive income (loss) (671,747)     (671,747)  
Implementation of accounting standard related to the reclassification of certain tax effects       127,554 (127,554)
Share-based compensation 6,046   6,046    
Issuance of common stock under compensation plans 7,504 902 6,602    
Stockholders' equity at end of period at Jun. 30, 2018 $ 2,426,825 $ 90,233 $ 804,094 $ 180,406 $ 1,352,092