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Stockholders' Equity - Incentive and Other (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
12 Months Ended 153 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
May 31, 2017
May 31, 2012
Mar. 29, 2007
Share Repurchase Program              
Share repurchase $ 19,550 $ 28,533 $ 9,007        
2012 Equity Incentive Plan              
Stockholders' Equity              
Number of shares authorized and reserved for issuance           5.1  
Number of shares available for issuance 2.9     2.9      
2017 Omnibus Incentive Plan              
Stockholders' Equity              
Number of shares authorized and reserved for issuance         2.9    
Number of shares available for issuance 2.4     2.4      
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     1.0
Number of additional shares of outstanding common stock authorized to be acquired under a stock repurchase program 0.8     0.8      
Share repurchase (in shares) 0.4     8.6      
Average price (in dollars per share) $ 45.58     $ 17.70      
Repurchased carrying basis $ 19,600     $ 19,600