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Stockholder's Equity and Stock-based Compensation - Stock Appreciation Rights (SARs) Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Beginning balance (in shares) 890,341 847,635 560,797
SARs granted (in shares) 10,000    
Exercised (in shares) (70,086) (15,000)  
SARs cancelled (in shares) (44,231) (47,612) (103,432)
SARs forfeited (in shares) (44,231)    
Ending balance (in shares) 785,890 890,341 847,635
Weighted Average Exercise Price      
Beginning balance (usd per share) $ 36.17    
Ending balance (usd per share) 35.33 $ 36.17  
SARs granted (usd per share) $ 15.23 $ 8.10 $ 2.04
Weighted average remaining contractual life, outstanding 5 years 4 months 24 days 6 years 4 months 24 days  
Aggregate intrinsic value, outstanding $ 572 $ 6,774  
Stock appreciation rights (SARs)      
Number of Shares      
Beginning balance (in shares) 565,864 1,416,133 216,532
SARs granted (in shares) 960,009   1,210,000
Exercised (in shares) (34,999) (713,330)  
SARs cancelled (in shares)   (136,939) (10,399)
SARs forfeited (in shares) (9,333)    
Ending balance (in shares) 1,481,541 565,864 1,416,133
Weighted Average Exercise Price      
Beginning balance (usd per share) $ 13.49 $ 7.70 $ 34.67
SARs granted (usd per share) 8.85   3.10
SARs exercised (usd per share) 3.10 3.10  
SARs cancelled (usd per share)   7.70 34.20
SARs forfeited (usd per share) 45.00    
Ending balance (usd per share) 10.53 $ 13.49 7.70
SARs granted (usd per share) $ 8.85   $ 17.55
Weighted average remaining contractual life, outstanding 8 years 1 month 6 days  
Aggregate intrinsic value, outstanding $ 718    
Exercisable and Vested      
Number of shares (in shares) 0    
Weighted average exercise price (usd per share) $ 0.00