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Restricted Stock Units - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Vested deferred restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested and remaining outstanding (in shares) 988,000 988,000  
Unvested units outstanding (in shares) 2,137,000 2,137,000 1,752,000
Unrecognized stock-based compensation expense $ 498 $ 498  
Vested deferred restricted stock units | Non-Employee Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested and remaining outstanding (in shares)   988,000  
Performance-based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested units outstanding (in shares) 1,519,000 1,519,000  
Unrecognized stock-based compensation expense $ 399 $ 399  
Time-based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested units outstanding (in shares) 617,000 617,000  
Unrecognized stock-based compensation expense $ 99 $ 99  
Weighted average period for amortization of unrecognized stock-based compensation   1 month  
Shares Withheld and Repurchased | Vested deferred restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares withheld and repurchased to satisfy tax obligation (in shares)   174,000  
Statutory tax withholding requirements   $ 46