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Stockholders' Equity - Incentive and Other (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
6 Months Ended 147 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Aug. 10, 2018
Mar. 29, 2007
Share Repurchase Program          
Share repurchase $ 7,897 $ 6,830      
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) 0.2   8.4    
Average price (in dollars per share) $ 49.09   $ 16.87    
Share repurchase $ 7,900