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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Retained Earnings
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 137,842       137,842
Other comprehensive income (loss) 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
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 404,193       404,193
Other comprehensive income (loss) (781,865)     (781,865)  
Implementation of accounting standard related to the reclassification of certain tax effects       127,554 (127,554)
Share-based compensation 8,444   8,444    
Issuance of common stock under compensation plans 8,367 947 7,420    
Stockholders' equity at end of period at Sep. 30, 2018 $ 2,489,296 $ 90,278 $ 807,310 $ 70,288 $ 1,521,420