Segment Reporting and Significant Concentration (Details 1)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Comcast [Member]
Summary of Revenues from Clients
Revenue by Major Client, Percentage	20.00%	19.00%	24.00%
DISH [Member]
Summary of Revenues from Clients
Revenue by Major Client, Percentage	14.00%	13.00%	18.00%
Time Warner [Member]
Summary of Revenues from Clients
Revenue by Major Client, Percentage	10.00%	10.00%	12.00%
Charter [Member] | Maximum [Member]
Summary of Revenues from Clients
Revenue by Major Client, Percentage	10.00%	10.00%	10.00%