Annual report pursuant to Section 13 and 15(d)

Stock-based and Long-Term Compensation (Details)

v3.3.1.900
Stock-based and Long-Term Compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost not yet recognized $ 4,512,000    
Compensation cost not yet recognized, period for recognition 3 years    
Common Class A      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 0    
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement by share-based payment award, compensation cost $ 0 $ 0 $ 0
Employee Stock Option | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award expiration period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years    
Employee Stock Option | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award expiration period 7 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Employee Stock Option | Common Class A      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options outstanding, weighted average remaining contractual term 2 years 4 months 24 days    
Options exercisable, weighted average remaining contractual term 2 years 3 months 11 days