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Stockholders' Equity - Stock Repurchase Program (Details) - $ / shares
12 Months Ended 50 Months Ended
Oct. 23, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Eleventh Plan        
Class of Stock [Line Items]        
Outstanding share, percent 5.00%      
Outstanding common shares in the plan 1,513,000      
Eleventh Plan        
Class of Stock [Line Items]        
Repurchased shares   0 138,000 579,996
Average price of shares repurchased (in usd per share)     $ 17.16 $ 16.67