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Share-Based Compensation - Narrative (Details)
9 Months Ended
Sep. 30, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Fair value assumptions, expected dividend rate 0.00%
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period 0
Long-Term Incentive Plan [Member] | Stock Option [Member] | Common Class B [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Allocated Share-based Compensation Expense | $ $ 0