Summary of Significant Accounting Policies (Details 7) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Revenue
Net deferred revenue	$ 1,627				$ 2,474				$ 1,627	$ 2,474
Severance									4,500
Total	2,957	1,379	2,707	1,470	1,343	10,571	3,195	10	8,513	15,119	269
Television
Deferred Revenue
Severance									1,500
Online
Deferred Revenue
Severance									3,000
Acquisition and Integration
Deferred Revenue
Investment banking fees										8,761
Legal, accounting and due diligence fees									750	4,085	269
Severance									4,510	1,094
Integration costs									1,655	526
Corporate strategic alternatives									1,398
Other									200	653
Total									8,513	15,119	269
Subscription and membership fees
Deferred Revenue
Net deferred revenue	1,400				1,373				1,400	1,373
Progress billings not yet recognized as revenue
Deferred Revenue
Net deferred revenue	$ 227				$ 1,101				$ 227	$ 1,101