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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 (Loss)
Retained Earnings
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
Stockholders' equity at beginning of period at Jun. 30, 2018 2,426,825 90,233 804,094 180,406 1,352,092
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 169,328       169,328
Other comprehensive income (loss) (110,118)     (110,118)  
Share-based compensation 2,398   2,398    
Issuance of common stock under compensation plans 863 45 818    
Stockholders' equity at end of period at Sep. 30, 2018 2,489,296 90,278 807,310 70,288 1,521,420
Stockholders' equity at beginning of period at Dec. 31, 2018 2,399,101 90,369 811,186 (52,432) 1,549,978
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 25,940       25,940
Other comprehensive income (loss) 1,691,861     1,691,861  
Share-based compensation 9,402   9,402    
Issuance of common stock under compensation plans 412 638 (226)    
Stockholders' equity at end of period at Sep. 30, 2019 4,126,716 91,007 820,362 1,639,429 1,575,918
Stockholders' equity at beginning of period at Jun. 30, 2019 3,497,475 90,936 817,997 1,049,984 1,538,558
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 37,360       37,360
Other comprehensive income (loss) 589,445     589,445  
Share-based compensation 2,042   2,042    
Issuance of common stock under compensation plans 394 71 323    
Stockholders' equity at end of period at Sep. 30, 2019 $ 4,126,716 $ 91,007 $ 820,362 $ 1,639,429 $ 1,575,918