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Incentive Plan - Narrative (Details) - USD ($)
3 Months Ended
Mar. 22, 2019
May 21, 2018
Mar. 15, 2017
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Tax benefit from compensation expense       $ 0 $ 0
Compensation expense       3,300,000 $ 6,800,000
Unrecognized compensation expense       $ 13,200,000  
Weighted average remaining life       1 year 10 months 24 days  
Stock options exercised (in shares)       0 0
Fair value of share based awards vested       $ 299,000 $ 49,000
Fair value of performance-based restricted stock units       1,000,000.0 4,800,000
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense       755,000 1,100,000
Unrecognized compensation expense       $ 2,500,000  
Options expiration period       10 years  
Vesting period       3 years  
Restricted stock awards and restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   10 months      
Fair value of share based awards vested       $ 33,000 77,000
Granted during period (in shares)   48,400   0  
Phantom Restricted Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense       $ 13,000 $ 276,000
Vesting period 3 years        
Shares issued (in shares) 370,350        
Phantom Restricted Stock Awards | Vesting Period One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage     33.33%    
Phantom Restricted Stock Awards | Vesting Period Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage     33.33%    
Phantom Restricted Stock Awards | Vesting Period Three          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage     33.33%