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Stock-Based Compensation (Details 2) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended			6 Months Ended		3 Months Ended		6 Months Ended
Stock-Based Compensation (Details 2) (USD $)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Non-Performance Based Stock Awards	Mar. 31, 2013 Stock Option Adjustment	Jun. 30, 2013 Subscriber-related	Jun. 30, 2012 Subscriber-related	Jun. 30, 2013 Subscriber-related	Jun. 30, 2012 Subscriber-related	Jun. 30, 2013 General and administrative	Jun. 30, 2012 General and administrative	Jun. 30, 2013 General and administrative	Jun. 30, 2012 General and administrative
Stock-Based Compensation
Non-cash, stock-based compensation	$ 4,557,000	$ 6,757,000	$ 14,776,000	$ 28,844,000		$ 4,000,000	$ 225,000	$ 357,000	$ 669,000	$ 1,194,000	$ 4,332,000	$ 6,400,000	$ 14,107,000	$ 27,650,000
Unrecognized compensation expense					$ 18,000,000
Future forfeiture rate (as a percent)					4.70%
Weighted-average period (in years)					2 years

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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