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Stock-Based and Other Long-Term Incentive Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number  of Shares      
Outstanding, beginning of period (in shares) 208,334 283,686  
Granted (in shares) 5,000 0  
Exercised (in shares) 0 (56,352)  
Canceled/Forfeited (in shares) (12,000) (8,000)  
Expired (in shares) (40,000) (11,000)  
Outstanding, end of period (in shares) 161,334 208,334 283,686
Exercisable (in shares) 161,334    
Weighted Average Exercise Price      
Outstanding, beginning of period (in dollars per share) $ 23.67 $ 20.46  
Granted (in dollars per share) 4.91 0  
Exercised (in dollars per share) 0 8.97  
Canceled/Forfeited, weighted average exercise price (in dollars per share) 20.20 21.60  
Expired (in dollars per share) 19.11 17.74  
Outstanding, end of period (in dollars per share) 24.48 $ 23.67 $ 20.46
Exercisable (in dollars per share) $ 24.48    
Weighted Average Remaining Contractual Life (years)      
Outstanding, weighted average remaining contractual life 3 years 5 months 23 days 3 years 7 months 28 days 3 years 6 months 29 days
Exercisable, weighted average remaining contractual life 3 years 5 months 23 days    
Aggregate Intrinsic Value      
Outstanding, aggregate intrinsic value $ 0 $ 0 $ 434
Exercised, aggregate intrinsic value 0 $ 474  
Canceled/Forfeited, aggregate intrinsic value 23,750    
Exercisable, aggregate intrinsic value $ 0