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Stock Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2019
Feb. 26, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum shares of common stock provided (in shares)     8,700,000    
Fair value of stock option awards outstanding (in shares)     3,225,000 3,064,000  
Aggregate intrinsic value     $ 800    
Aggregate intrinsic value exercisable     $ 400    
Quoted closing market price     $ 15.53    
Weighted average contractual term     2 years 10 months 16 days    
Total intrinsic value of options exercised     $ 7,000 $ 13,200 $ 1,600
Tax related benefits realized from the exercise of stock options     5,700 5,000 500
Unrecognized compensation expense related to unvested stock options     $ 9,300    
Weighted average remaining requisite service period of unvested stock awards     1 year 7 months 25 days    
Fair value of option shares vested     $ 11,800 2,100 3,000
Stock-based compensation expense     17,200 16,654 12,362
Stock based long term liability     $ (1,100) 400 1,400
Options granted (in shares)     563,000    
Aggregate intrinsic value for the restricted stock and restricted stock units outstanding     $ 22,000    
Tax benefits recognized for stock based compensation     4,800 6,800 4,300
Capitalized stock-based compensation     4,400    
Expensed stock-based compensation     $ 17,200    
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of shares     3 years    
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of shares     4 years    
Class A          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum shares that may be issued pursuant to options or restricted stock grants (in shares)     3,481,569    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average remaining requisite service period of unvested stock awards     10 months 25 days    
Unrecognized compensation expense related to unvested restricted stock and restricted stock units     $ 22,000    
Fair value of restricted stock and restricted stock units vested     13,000 9,900 4,600
Restricted stock or unit expenses     $ 15,300 12,900 6,600
Restricted Stock | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of shares     1 year    
Restricted Stock | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of shares     4 years    
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum vesting period     5 years    
Maximum vesting period 2     6 years    
Maximum vesting period 3     10 years    
Stock-based compensation expense     $ 6,300 $ 7,100 $ 5,900
Subsequent Event | Service-Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of shares   3 years      
Subsequent Event | Service-Based Restricted Stock Units | Common stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares) 428,005        
Subsequent Event | Performance-Based Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of shares   3 years      
Subsequent Event | Performance-Based Stock Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 0.00%        
Subsequent Event | Performance-Based Stock Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 200.00%        
Subsequent Event | Performance-Based Stock Units | Common stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares) 428,005        
2003 Stock and Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of stock option awards outstanding (in shares)     67,500 75,000 77,500