Summary of Significant Accounting Policies - Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2013
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	7 years
Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	10 years
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	15 years
Internally developed software
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	3 years
Proprietary content
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	2 years