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Capital Stock - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2019
Oct. 31, 2019
Jul. 31, 2019
Apr. 30, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Equity [Abstract]                      
Increase in shares authorized     25,000,000.0                
Shares repurchased                     15,500,000
Cost of share repurchases (in usd)         $ 190,808 $ 125,260 $ 28 $ 162,660 $ 274,337 $ 207,135 $ 316,100
Shares available for repurchase         21,000,000.0           21,000,000.0
Class of Stock [Line Items]                      
Cash dividends, per share (in dollars per share) $ 0.07     $ 0.09 $ 0.09 $ 0.09 $ 0.07 $ 0.06 $ 0.06 $ 0.06  
Subsequent Event                      
Class of Stock [Line Items]                      
Cash dividends, per share (in dollars per share)   $ 0.10