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Equity-Based Compensation - (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
installment
$ / shares
shares
Mar. 31, 2017
USD ($)
Employee stock-based compensation expense    
Equity-based compensation expense $ 1,268 $ 562
2013 Stock Incentive Plan    
Employee stock-based compensation expense    
Equity-based compensation expense 1,268 562
Tax benefit from share-based compensation (179) (123)
Excess tax benefit from share-based compensation (72) (207)
Net compensation cost $ 1,017 232
Restricted Stock Units    
Additional shares available to grant under plan (in shares) | shares 2,379,333  
Time-based Restricted Stock Units    
Restricted Stock Units    
Nonvested at beginning of period | shares 105,862  
Granted | shares 174,708  
Shares vested (including tax withholding) | shares [1] (46,520)  
Nonvested at end of period | shares 234,050  
Nonvested at beginning of period, Weighted average grant date fair value per share | $ / shares $ 41.67  
Granted, Weighted average grant date fair value per share | $ / shares 55.51  
Shares vested (including tax withholding), Weighted average grant date fair value per share | $ / shares [1] 44.32  
Nonvested at end of period, Weighted average grant date fair value per share | $ / shares $ 51.48  
Unrecognized compensation cost $ 11,100  
Period for recognition of RSU compensation expense 3 years 5 months 27 days  
Time-based Restricted Stock Units | 2013 Stock Incentive Plan    
Employee stock-based compensation expense    
Equity-based compensation expense $ 800 527
Time-based Restricted Stock Units | Directors    
Restricted Stock Units    
Vesting Period 1 year  
Time-based Restricted Stock Units | Employees    
Restricted Stock Units    
Vesting Period 3 years  
Performance-based Restricted Stock Units    
Restricted Stock Units    
Nonvested at beginning of period | shares 31,831  
Granted | shares [2] 107,311  
Nonvested at end of period | shares 139,142  
Nonvested at beginning of period, Weighted average grant date fair value per share | $ / shares $ 57.88  
Granted, Weighted average grant date fair value per share | $ / shares [2] 55.20  
Nonvested at end of period, Weighted average grant date fair value per share | $ / shares $ 55.81  
Period of performance measurement 3 years  
Unrecognized compensation cost $ 6,400  
Period for recognition of RSU compensation expense 1 year 6 months 7 days  
Performance-based Restricted Stock Units | Minimum    
Restricted Stock Units    
Shares issued upon participants target award 0.00%  
Performance-based Restricted Stock Units | Maximum    
Restricted Stock Units    
Shares issued upon participants target award 150.00%  
Performance-based Restricted Stock Units | 2013 Stock Incentive Plan    
Employee stock-based compensation expense    
Equity-based compensation expense $ 468 $ 35
booj, LLC | Time-based Restricted Stock Units    
Restricted Stock Units    
Vesting Period 4 years  
Number of installments in a vesting period | installment 3  
booj, LLC | Performance-based Restricted Stock Units | Minimum    
Restricted Stock Units    
Shares issued upon participants target award 0.00%  
booj, LLC | Performance-based Restricted Stock Units | Maximum    
Restricted Stock Units    
Shares issued upon participants target award 100.00%  
[1] Pursuant to the terms of the 2013 Incentive Plan, RSUs withheld by the Company for the payment of the employee's tax withholding related to an RSU vesting are added back to the pool of shares available for future awards.
[2] Represents the total participant target award.