Annual report pursuant to Section 13 and 15(d)

Stock-based and Long-Term Compensation (Details)

v2.4.1.9
Stock-based and Long-Term Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Compensation Cost Not yet Recognized $ 3,236us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Compensation Cost Not yet Recognized, Period for Recognition 4 years  
Common Class A    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Employee Stock Option | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award Expiration Period 4 years  
Employee Stock Option | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award Expiration Period 5 years  
Employee Stock Option | Common Class A    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options Outstanding, Intrinsic Value 890us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Options Exercisable, Intrinsic Value $ 407us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Options Outstanding, Weighted Average Remaining Contractual Term 3 years 6 months  
Options Exercisable, Weighted Average Remaining Contractual Term 3 years 3 months 18 days