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Equity-Based Compensation - Summary of Status of Equity-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Summary of Status of Equity-Based Compensation Plans      
Other accrued liabilities $ 6,081 $ 7,291  
2014 Plan      
Summary of Status of Equity-Based Compensation Plans      
Awards originally available 1,500,000    
Shares outstanding 705,925    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 1,000,925    
Vested and released - shares 173,554    
Awards available for grant 325,521    
2009 Plan      
Summary of Status of Equity-Based Compensation Plans      
Awards originally available 3,400,000    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 122,600    
Awards available for grant 0    
2004 Plan      
Summary of Status of Equity-Based Compensation Plans      
Awards originally available 6,500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 57,391    
Awards available for grant 0    
Directors' Plan      
Summary of Status of Equity-Based Compensation Plans      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 9,620    
Awards available for grant 0    
RSUs | 2009 Plan      
Summary of Status of Equity-Based Compensation Plans      
Shares outstanding 122,600    
Vested and released - shares 0    
RSUs | 2004 Plan      
Summary of Status of Equity-Based Compensation Plans      
Shares outstanding 57,391    
RSUs | Directors' Plan      
Summary of Status of Equity-Based Compensation Plans      
Shares outstanding 9,620    
Performance-Based Stock Options | 2014 Plan      
Summary of Status of Equity-Based Compensation Plans      
Awards originally available 350,000    
Shares outstanding 295,000    
Stock options outstanding 295,000    
Cash Settled Awards      
Summary of Status of Equity-Based Compensation Plans      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 14,252   12,074
Other accrued liabilities $ 214   $ 115
Officers, key employees, and non-employee directors | Service-Based RSUs      
Share-based Compensation      
Releasable - weighted average fair value $ 11.38    
Summary of Status of Equity-Based Compensation Plans      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 379,343 554,478