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Stock-Based Compensation (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair value assumptions      
Expected dividend payments $ 0.00    
Stock Options      
Options activity      
Outstanding at beginning of period 370,547 460,213 446,365
Granted in period 33,855 15,037 197,318
Exercised in period 0 0 3,500
Unvested options forfeitures in period 9,872 57,014 65,982
Vested expired in period 85,563 47,689 113,988
Outstanding at end of period 308,967 370,547 460,213
Vested and expected to vest at end of period 308,967    
Exercisable at end of period 201,594    
Weighted average exercise price      
Outstanding at beginning of period $ 77.23 $ 87.36 $ 114.99
Granted in period 10.00 26.15 57.26
Exercised in period 0.00 0.00 60.40
Unvested options forfeited in period 73.31 75.74 79.59
Vested expired in period 110.44 160.61 148.83
Outstanding at end of period 60.80 $ 77.23 $ 87.36
Vested and expected to vest at end of period 60.80    
Exercisable at end of period $ 75.42    
Weighted average remaining contractual term      
Outstanding at end of period 5 years 10 months 10 days    
Vested and expected to vest at end of period 5 years 10 months 10 days    
Exercisable at end of period 4 years 7 months 28 days    
Intrinsic Value      
Intrinsic value of exercises in period $ 0 $ 0 $ 67
Intrinsic value of options outstanding 0    
Intrinsic value of options vested and expected to vest 0    
Intrinsic value of options exercisable $ 0    
Fair value assumptions      
Expected term 6 years 3 months 6 years 3 months 6 years 2 months 27 days
Expected stock price volatility 53.70% 44.80% 40.60%
Risk-free interest rate 2.16% 1.48% 1.58%
Expected dividend yield 0.00% 0.00% 5.69%
Additional disclosures      
Weighted average grant date fair value $ 5.32 $ 11.66 $ 13.60
Unrecognized compensation cost $ 700    
Unrecognized compensation cost, recognition period 2 years 2 months 5 days    
Cash Stock Appreciation Rights      
Options activity      
Outstanding at beginning of period 0    
Granted in period 86,618    
Exercised in period 0    
Unvested options forfeitures in period 0    
Outstanding at end of period 86,618 0  
Vested and expected to vest at end of period 86,618    
Exercisable at end of period 0    
Weighted average exercise price      
Outstanding at beginning of period $ 0.00    
Granted in period 9.70    
Exercised in period 0.00    
Unvested options forfeited in period 0.00    
Outstanding at end of period 9.70 $ 0.00  
Vested and expected to vest at end of period 9.70    
Exercisable at end of period $ 0.00    
Weighted average remaining contractual term      
Outstanding at end of period 9 years 5 months 23 days    
Vested and expected to vest at end of period 9 years 5 months 23 days    
Exercisable at end of period 0 years    
Fair value assumptions      
Expected term 6 years 3 months    
Expected stock price volatility 54.45%    
Risk-free interest rate 2.23%    
Expected dividend yield 0.00%    
Expected dividend payments $ 0.00    
Additional disclosures      
Unrecognized compensation cost $ 400    
Unrecognized compensation cost, recognition period 3 years 5 months 23 days    
Restricted Stock Units      
Additional disclosures      
Unrecognized compensation cost $ 2,100    
Unrecognized compensation cost, recognition period 1 year 11 months 9 days    
Award activity      
Outstanding at beginning of period 94,543 96,215 79,007
Granted in period 160,962 74,192 83,626
Vested in period 40,979 36,492 50,507
Forfeited in period 13,304 39,372 15,911
Outstanding at end of period 201,222 94,543 96,215
Weighted average grant date fair value      
Outstanding at beginning of period $ 37.59 $ 65.69 $ 80.89
Granted in period 9.81 26.32 63.80
Vested in period 41.39 66.96 82.27
Forfeited in period 27.84 57.79 78.39
Outstanding at end of period $ 15.23 $ 37.59 $ 65.69
Phantom Stock Units      
Additional disclosures      
Unrecognized compensation cost, recognition period 3 years 22 days    
Award activity      
Outstanding at beginning of period 53,164 0  
Granted in period 56,000 78,140  
Vested in period 12,483 0  
Forfeited in period 14,644 24,976  
Outstanding at end of period 82,037 53,164 0
Weighted average grant date fair value      
Outstanding at beginning of period $ 26.90 $ 0.00  
Granted in period 9.70 26.90  
Vested in period 26.90 0.00  
Forfeited in period 22.63 26.90  
Outstanding at end of period $ 15.92 $ 26.90 $ 0.00
Additional disclosures      
Unrecognized compensation cost $ 700    
Performance Stock Units      
Additional disclosures      
Unrecognized compensation cost $ 1,300    
Unrecognized compensation cost, recognition period 1 year 8 months 23 days    
Award activity      
Outstanding at beginning of period 84,430 70,134 60,363
Granted in period 89,124 47,300 66,982
Vested in period 0 0 0
Forfeited in period 10,494 33,004 57,211
Outstanding at end of period 163,060 84,430 70,134
Weighted average grant date fair value      
Outstanding at beginning of period $ 25.56 $ 45.05 $ 76.07
Granted in period 9.95 19.00 43.02
Vested in period 0.00 0.00 0.00
Forfeited in period 47.90 57.59 75.40
Outstanding at end of period $ 15.59 $ 25.56 $ 45.05
Cash Performance Stock Units      
Additional disclosures      
Unrecognized compensation cost, recognition period 2 years 1 month 17 days    
Award activity      
Outstanding at beginning of period 44,397 0  
Granted in period 109,887 51,209  
Exercised in period 0 0  
Forfeited in period 3,778 6,812  
Outstanding at end of period 150,506 44,397 0
Weighted average grant date fair value      
Outstanding at beginning of period $ 26.90 $ 0.00  
Granted in period 10.10 26.90  
Vested in period 0.00 0.00  
Forfeited in period 26.90 26.90  
Outstanding at end of period $ 14.63 $ 26.90 $ 0.00
Additional disclosures      
Unrecognized compensation cost $ 900