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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 (loss) 140,962       140,962
Other comprehensive income (loss) (452,171)     (452,171)  
Implementation of accounting standard related to the reclassification of certain tax effects       127,554 (127,554)
Share-based compensation 3,526   3,526    
Issuance of common stock under compensation plans 4,516 653 3,863    
Stockholders' equity at end of period at Mar. 31, 2018 2,546,990 89,984 798,835 399,982 1,258,189
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 (loss) (30,010)       (30,010)
Other comprehensive income (loss) 566,129     566,129  
Share-based compensation 4,205   4,205    
Issuance of common stock under compensation plans 112 415 (303)    
Stockholders' equity at end of period at Mar. 31, 2019 $ 2,939,537 $ 90,784 $ 815,088 $ 513,697 $ 1,519,968