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Equity-Based Compensation - Schedule of Performance-Based RSUs (Details 7) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Feb. 09, 2017
Feb. 16, 2016
Feb. 05, 2015
Weighted Average Grant Date Fair Value            
End of year, Weighted-average Grant-Date Fair Value $ 18.77          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 271,305          
Performance-Based RSUs            
Weighted Average Grant Date Fair Value            
Beginning of year, Weighted-average Grant-Date Fair Value $ 16.48          
Granted, Weighted-average Grant-Date Fair Value 23.83          
Converted, Weighted-average Grant-Date Fair Value 21.66          
Forfeited, Weighted-average Grant-Date Fair Value 22.56          
End of year, Weighted-average Grant-Date Fair Value   $ 16.48        
Convertible at end of period, Weighted-average Grant-Date Fair Value 0.00          
Target Based Vesting of Performance Based RSUs weighted average grant date fair value $ 21.66          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number   201,900        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 123,919          
Target based Vesting of performance-based restricted stock unit 15,285          
Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Converted (43,275)          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (26,524)          
Released at end of period, RSUs 0          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]            
Weighted Average Remaining Contractual Term 1 year 7 months 15 days          
Aggregate intrinsic value, outstanding value $ 6,986          
Shared Based Compensation Maximum Potential Awards 501,941   8,000 143,592 185,680 124,000
Target Units Outstanding 271,305   4,000 71,796 92,840 62,000
Convertible Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Aggregate Intrinsic Value $ 0          
Performance-Based Operating Income RSU [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]            
Shared Based Compensation Maximum Potential Awards       40,669    
Target Units Outstanding       40,669