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Share Repurchases (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Share Repurchases [Line Items]          
Accelerated Share Repurchases, Settlement (Payment) or Receipt   $ 700,000   $ 700,000  
Purchase of common stock     $ 0 $ 744,977  
January 2015 Authorization [Member]          
Share Repurchases [Line Items]          
Share repurchases       440,608  
Purchase of common stock       $ 44,977  
Treasury Stock Acquired, Average Cost Per Share       $ 102.08  
Remaining number of shares authorized to be repurchased   5,271,168   5,271,168  
February 2018 Authorization [Member]          
Share Repurchases [Line Items]          
Accelerated Shares Repurchased 1,463,815 7,078,751     8,542,566
Accelerated Share Repurchases, Final Price Paid Per Share         $ 81.94
Number of shares authorized to be repurchased   20,000,000   20,000,000  
Share repurchases     0    
Remaining number of shares authorized to be repurchased     9,703,666