XML 408 R100.htm IDEA: XBRL DOCUMENT v3.8.0.1
Equity-Based Compensation - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
plan
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
Equity-Based Compensation      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ $ 5,471 $ 4,959 $ 2,803
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 271,305    
Equity-Based Compensation      
Number of Equity Based Compensation Plan | plan 4    
Other accrued liabilities | $ $ 11,190 $ 8,924  
Options      
Equity-Based Compensation      
Stock options exercisable cumulative annual installments period 10 years    
Stock option contractual term 10 years    
Employee Service Share Based Compensation Awards Stock Options Outstanding 0 0  
Service-Based RSUs      
Equity-Based Compensation      
Number of shares issuable, against each unit of RSU 1    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights three    
Performance-Based RSUs      
Equity-Based Compensation      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number   201,900  
Equity-Based Compensation      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights three    
RSU      
Equity-Based Compensation      
Tax benefit from the issuance of stock | $ $ 1,927    
Cash Settled Awards [Member]      
Equity-Based Compensation      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 14,082 12,074  
Equity-Based Compensation      
Other accrued liabilities | $ $ 241 $ 170  
Minimum | Options      
Equity-Based Compensation      
Vesting period 4 years    
Minimum | Performance-Based RSUs      
Equity-Based Compensation      
Vesting percent 0.00%    
Maximum | Performance-Based RSUs      
Equity-Based Compensation      
Vesting percent 200.00%