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Stockholder's Equity - Share-Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stockholder's Equity      
Taxes paid related to net share settlement on equity awards $ 364 $ 948 $ 1,520
Cash received under all share-based arrangements 0    
Compensation expense $ 2,300 1,600 4,200
Expected volatility rate (as a percent) 24.10%    
Risk free interest rate (as a percent) 0.85%    
Dividend rate (as a percent) 0.00%    
Incremental value treated as additional expense     600
Restricted Stock Units      
Stockholder's Equity      
Unrecognized share-based compensation expense $ 3,700    
Expected weighted average recognition period 2 years    
Fair value of restricted stock units vested $ 1,000 $ 2,600 $ 3,900
Shares withheld to cover withholding tax of unit holders 15,772 36,592 53,775
Taxes paid related to net share settlement on equity awards $ 400 $ 900 $ 1,500
Performance Shares      
Stockholder's Equity      
Compensation expense $ 600