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Stockholders' Equity - Incentive and Other (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
6 Months Ended 159 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Nov. 19, 2019
Mar. 29, 2007
Share Repurchase Program          
Share repurchase $ 11,006 $ 7,897      
Stock Repurchase Program 2007          
Share Repurchase Program          
Number of shares of outstanding common stock authorized to be acquired under a stock repurchase program 9.5   9.5 0.8 1.0
Share repurchase (in shares) 0.3   8.9    
Average price (in dollars per share) $ 37.91   $ 18.36    
Share repurchase $ 11,000