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Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total Stockholders' Equity at Dec. 31, 2017 $ 2,930,250 $ 3 $ 361,231 $ (217) $ 1,830,439 $ 738,794
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) Attributable to Parent 656,774       656,774  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 44,548         44,548
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition 5,885   5,885      
Proceeds from Issuance of Common Stock 3,872   3,872      
Total Stockholders' Equity at Mar. 31, 2018 4,488,091 3 370,988 (217) 4,013,232 104,085
Total Stockholders' Equity at Dec. 31, 2018 4,020,331 3 394,342 (49,129) 3,722,073 (46,958)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income (Loss) Attributable to Parent 865,195       865,195  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (34,007)         (34,007)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition 8,505   8,505      
Treasury Stock Reissued at Lower than Repurchase Price 3,831     5,398 (1,567)  
Proceeds from Issuance of Common Stock 0          
Total Stockholders' Equity at Mar. 31, 2019 $ 4,863,855 $ 3 $ 402,847 $ (43,731) $ 4,585,701 $ (80,965)