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Stockholders' Equity - Incentive and Other (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 132 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 29, 2007
Share Repurchase Program        
Payments for Repurchase of Common Stock $ 4,293 $ 2,197    
Stock Repurchase Program 2007        
Share Repurchase Program        
Number of shares of outstanding common stock authorized to be acquired under a stock repurchase program 8,100,000   8,100,000 1,000,000
Share repurchase (in shares)     7,800,000  
Average price (in dollars per share) $ 41.04   $ 14.28  
Payments for Repurchase of Common Stock $ 6,200      
Shares purchased not settled or paid until later date 46,000   46,000  
Stock Repurchase Program 2007 | Maximum        
Share Repurchase Program        
Share repurchase (in shares) 200,000