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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, 2018
Dec. 31, 2017
Summary of Status of Equity-Based Compensation Plans    
Other accrued liabilities $ 6,616 $ 7,367
2018 Plan    
Summary of Status of Equity-Based Compensation Plans    
Awards originally available 2,500,000  
Shares outstanding 0  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Released Number 0  
Awards available for grant 2,500,000  
2014 Plan    
Summary of Status of Equity-Based Compensation Plans    
Awards originally available 1,500,000  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Released Number 0  
2009 Plan    
Summary of Status of Equity-Based Compensation Plans    
Awards originally available 3,400,000  
2004 Plan    
Summary of Status of Equity-Based Compensation Plans    
Awards originally available 6,500,000  
RSUs | 2014 Plan    
Summary of Status of Equity-Based Compensation Plans    
Shares outstanding 732,642  
RSUs | 2009 Plan    
Summary of Status of Equity-Based Compensation Plans    
Shares outstanding 92,600  
RSUs | 2004 Plan    
Summary of Status of Equity-Based Compensation Plans    
Shares outstanding 35,952  
RSUs | Directors' Plan    
Summary of Status of Equity-Based Compensation Plans    
Shares outstanding 5,522  
Performance-Based Stock Options | 2018 Plan    
Summary of Status of Equity-Based Compensation Plans    
Stock options outstanding 0  
Performance-Based Stock Options | 2014 Plan    
Summary of Status of Equity-Based Compensation Plans    
Awards originally available 350,000  
Shares outstanding 285,000  
Stock options outstanding 285,000  
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 17,248 14,082
Other accrued liabilities $ 321 $ 241
Officers, key employees, and non-employee directors | Service-Based RSUs    
Share-based Compensation    
Releasable - weighted average fair value $ 12.82  
Summary of Status of Equity-Based Compensation Plans    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 340,997 399,347