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Stock-Based Compensation - Schedule of SAR Activity (Details) - SARs - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Shares          
Outstanding, beginning balance (in shares) 152,600 302,581 242,581 362,581  
Granted (in shares) 5,000 106,800 60,000 0  
Exercised (in shares) 0 0 0 (120,000)  
Forfeited (in shares) (67,130) (195,490) 0 0  
Expired (in shares) (6,750) (61,291) 0 0  
Outstanding, ending balance (in shares) 83,720 152,600 302,581 242,581 362,581
Exercisable (in shares) 39,360 0 61,291 61,291  
Weighted-Average Exercise Price          
Outstanding, beginning balance (in dollars per share) $ 16.55 $ 22.53 $ 22.07 $ 22.07  
Granted (in dollars per share) 7.37 11.43 24.41 0.00  
Exercised (in dollars per share) 0.00 0.00 0.00 22.07  
Forfeited (in dollars per share) 23.16 21.28 0.00 0.00  
Expired (in dollars per share) 12.68 22.07 0.00 0.00  
Outstanding, ending balance (in dollars per share) 11.02 16.55 22.53 22.07 $ 22.07
Exercisable (in dollars per share) $ 11.25 $ 0.00 $ 22.07 $ 22.07  
Weighted-Average Remaining Contractual Term (years)          
Outstanding (term) 8 years 2 months 16 days 9 years 7 days 7 years 1 month 6 days 7 years 5 months 8 days 8 years 5 months 8 days
Exercisable (term) 8 years 1 month 24 days   6 years 5 months 8 days 7 years 5 months 8 days  
Aggregate Intrinsic Value (in thousands)          
Outstanding $ 1,000 $ 0 $ 0 $ 7,166 $ 19,228
Exercised       6,673  
Exercisable $ 0 $ 0 $ 0 $ 1,811