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Share Repurchase Program and Treasury Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Stock Repurchase Program, Additional Authorized Amount     $ 2,000,000
Share Repurchase Program and Treasury Stock (Textuals) [Abstract]      
Authorized amount under share repurchase program $ 1,900,000    
Shares Purchased Under Share Repurchase Program 27,800,000    
Repurchases of common stock $ (186,250) $ (118,750)  
Number of shares repurchased (290,429) (187,880)  
Average price of share repurchased, per share $ 641.27 $ 632.03  
Exercise of stock options and restricted stock units, shares reissued 171,752 39,362