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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) 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
Stockholders' equity at beginning of period at Mar. 31, 2018 2,546,990 89,984 798,835 399,982 1,258,189
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 93,903       93,903
Other comprehensive income (loss) (219,576)     (219,576)  
Share-based compensation 2,520   2,520    
Issuance of common stock under compensation plans 2,988 249 2,739    
Stockholders' equity at end of period at Jun. 30, 2018 2,426,825 90,233 804,094 180,406 1,352,092
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) (11,420)       (11,420)
Other comprehensive income (loss) 1,102,416     1,102,416  
Share-based compensation 7,360   7,360    
Issuance of common stock under compensation plans 18 567 (549)    
Stockholders' equity at end of period at Jun. 30, 2019 3,497,475 90,936 817,997 1,049,984 1,538,558
Stockholders' equity at beginning of period at Mar. 31, 2019 2,939,537 90,784 815,088 513,697 1,519,968
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss) 18,590       18,590
Other comprehensive income (loss) 536,287     536,287  
Share-based compensation 3,155   3,155    
Issuance of common stock under compensation plans (94) 152 (246)    
Stockholders' equity at end of period at Jun. 30, 2019 $ 3,497,475 $ 90,936 $ 817,997 $ 1,049,984 $ 1,538,558