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Equity-Based Compensation - Summary of Status of Equity-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Summary of Status of Equity-Based Compensation Plans      
Other accrued liabilities $ 4,694 $ 7,291  
2014 Plan      
Summary of Status of Equity-Based Compensation Plans      
Awards originally available 1,500,000    
Shares outstanding 731,143    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 1,046,143    
Vested and released - shares 171,118    
Awards available for grant 282,739    
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 125,257    
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 125,257    
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 315,000    
Stock options outstanding 315,000    
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 15,522   12,074
Other accrued liabilities $ 161   $ 0
Officers, key employees, and non-employee directors | Service-Based RSUs      
Share-based Compensation      
Releasable - weighted average fair value $ 11.42    
Summary of Status of Equity-Based Compensation Plans      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 385,938 554,478