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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, 2019
Dec. 31, 2018
Summary of Status of Equity-Based Compensation Plans    
Other accrued liabilities $ 4,625 $ 6,165
2018 Plan    
Summary of Status of Equity-Based Compensation Plans    
Awards originally available 2,500,000  
Shares outstanding 243,943  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Released Number 0  
Awards available for grant 2,256,057  
2014 Plan    
Summary of Status of Equity-Based Compensation Plans    
Awards originally available 1,500,000  
Awards available for grant 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 419,793  
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 250,000  
Stock options outstanding 250,000  
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 17,468 17,248
Other accrued liabilities $ 211 $ 300
Officers, key employees, and non-employee directors | Service-Based RSUs    
Share-based Compensation    
Releasable - weighted average fair value $ 13.79  
Summary of Status of Equity-Based Compensation Plans    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 346,640 355,590