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Stock Based Compensation - Cash Performance Units (Details) - Cash Performance - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Stock based compensation    
Grant date fair value $ 663  
Valuation Assumptions:    
Expected term in years 3 years  
Volatility (as a percent) 48.00%  
Risk-free interest rate 1.50%  
Dividend yield (as a percent) 4.00%  
Number of Cash Performance Units    
Units outstanding at the beginning of the period (in shares) 822,915  
Granted (in shares)   932,837
Vested (in shares) (274,854)  
Forfeited (in shares) (123,049)  
Units outstanding at the end of the period (in shares) 425,012 822,915
Accrued expenses    
Stock based compensation    
Cash performance liability $ 96  
Other Long Term Liabilities    
Stock based compensation    
Cash performance liability $ 64