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Stock Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 16, 2017
Feb. 15, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 10, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum shares of common stock provided           8,700,000
Aggregate intrinsic value     $ 29,400      
Aggregate intrinsic value exercisable     $ 13,600      
Quoted closing market price     $ 25.76      
Weighted average contractual term     1 year 1 month 39 days      
Total intrinsic value of options exercised     $ 1,600 $ 1,300 $ 200  
Tax related benefits realized from the exercise of stock options     500 300 100  
Stock-based compensation expense     12,362 9,450 5,524  
Stock based long term liability     1,400 0 1,400  
Stock based current liability     0 1,000 0  
Unrecognized compensation expense related to unvested stock options     $ 6,900      
Weighted average remaining requisite service period of unvested stock awards     1 year 10 months 24 days      
Fair value of option shares vested     $ 3,000 1,300 1,500  
Options granted     668,000      
Restricted stock or unit expenses       0 3,023  
Aggregate intrinsic value for the restricted stock and restricted stock units outstanding     $ 28,900      
Tax benefits recognized for stock based compensation     $ 4,300 3,400 1,900  
Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period of shares     3 years      
Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period of shares     4 years      
Class A [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum shares that may be issued pursuant to options or restricted stock grants     3,481,569      
Restricted stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average remaining requisite service period of unvested stock awards     1 year 9 months 4 days      
Restricted stock or unit expenses     $ 6,600 4,700 3,000  
Unrecognized compensation expense related to unvested restricted stock and restricted stock units     12,500      
Fair value of restricted stock and restricted stock units vested     $ 4,600 800 900  
Stock options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum vesting period     5 years      
Maximum vesting period     10 years      
Stock-based compensation expense     $ 5,900 $ 4,700 $ 2,500  
Subsequent Event [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted 444,491 590,128        
Share Based Compensation Arrangement By Share Based Payment Award Options and Restricted Stock Grants In Period Fair Value $ 9,300 $ 12,400        
Subsequent Event [Member] | Restricted stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period of shares 3 years 3 years        
Restricted stock grants 174,561 228,174        
Weighted average fair value, Granted $ 26.86 $ 27.26        
Subsequent Event [Member] | Stock options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period of shares 3 years 3 years        
Restricted stock grants 174,561 228,174        
Weighted average fair value, Granted $ 26.86 $ 27.26