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Stockholders' Equity - Incentive and Other (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
9 Months Ended 150 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Aug. 10, 2018
Mar. 29, 2007
Share Repurchase Program          
Share repurchase $ 15,317 $ 11,573      
Stock Repurchase Program 2007          
Share Repurchase Program          
Number of shares of outstanding common stock authorized to be acquired under a stock repurchase program 8.8   8.8 0.7 1.0
Share repurchase (in shares) 0.3   8.5    
Average price (in dollars per share) $ 44.43   $ 17.38    
Share repurchase $ 15,300