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Equity-Based Compensation - SARs Outstanding (Details) - SARs - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of SARs outstanding (in shares) 306,575 307,514 479,656 548,482
Number of SARs exercisable (in shares) 306,575 281,221 453,781  
Aggregate intrinsic value of SARs outstanding as of December 31, 2017 (in thousands) $ 1,327 $ 800 $ 600  
$6.70 - $8.76        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant Price, lower range limit (in dollars per share) $ 6.70      
Grant Price, upper range limit (in dollars per share) $ 8.76      
Number of SARs outstanding (in shares) 29,950      
Number of SARs exercisable (in shares) 29,950      
Weighted average remaining contractual life of SARs outstanding (in years) 8 months 19 days      
Aggregate intrinsic value of SARs outstanding as of December 31, 2017 (in thousands) $ 215      
$9.02 - $9.25        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant Price, lower range limit (in dollars per share) $ 9.02      
Grant Price, upper range limit (in dollars per share) $ 9.25      
Number of SARs outstanding (in shares) 43,625      
Number of SARs exercisable (in shares) 43,625      
Weighted average remaining contractual life of SARs outstanding (in years) 6 years 9 months      
Aggregate intrinsic value of SARs outstanding as of December 31, 2017 (in thousands) $ 283      
$11.69 - $17.31        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant Price, lower range limit (in dollars per share) $ 11.69      
Grant Price, upper range limit (in dollars per share) $ 17.31      
Number of SARs outstanding (in shares) 233,000      
Number of SARs exercisable (in shares) 233,000      
Weighted average remaining contractual life of SARs outstanding (in years) 3 years 3 months 7 days      
Aggregate intrinsic value of SARs outstanding as of December 31, 2017 (in thousands) $ 829