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Equity-Based Compensation - SARs Outstanding (Details) - SARs - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of SARs Outstanding (in shares) 479,656 548,482 1,232,808 4,338,250
Number of SARs Exercisable (in shares) 453,781 445,238 966,045  
Aggregate intrinsic value of SARs outstanding as of December 31, 2015 (in thousands) $ 555 $ 4,300 $ 0  
$6.70 - $8.76        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of SARs Outstanding (in shares) 68,264      
Number of SARs Exercisable (in shares) 68,264      
Weighted average remaining contractual life of SARs outstanding (in years) 3 years 2 months 5 days      
Aggregate intrinsic value of SARs outstanding as of December 31, 2015 (in thousands) $ 238      
Grant Price, lower range limit $ 6.70      
Grant Price, upper range limit $ 8.76      
$9.25 - $9.84        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of SARs Outstanding (in shares) 144,095      
Number of SARs Exercisable (in shares) 120,981      
Weighted average remaining contractual life of SARs outstanding (in years) 6 years 5 months 16 days      
Aggregate intrinsic value of SARs outstanding as of December 31, 2015 (in thousands) $ 317      
Grant Price, lower range limit $ 9.25      
Grant Price, upper range limit $ 9.84      
$11.69 - $17.31        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of SARs Outstanding (in shares) 267,297      
Number of SARs Exercisable (in shares) 264,536      
Weighted average remaining contractual life of SARs outstanding (in years) 5 years 1 month 6 days      
Aggregate intrinsic value of SARs outstanding as of December 31, 2015 (in thousands) $ 0      
Grant Price, lower range limit $ 11.69      
Grant Price, upper range limit $ 17.31