Acquisition (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Summary of identifiable intangible assets acquired and their respective weighted average lives
Intangible Assets, Assigned Value	$ 4,815
Customer relationships [Member]
Summary of identifiable intangible assets acquired and their respective weighted average lives
Intangible Assets, Assigned Value	3,605
Intangible Assets, Useful Life	7 years 6 months
Research content [Member]
Summary of identifiable intangible assets acquired and their respective weighted average lives
Intangible Assets, Assigned Value	1,080
Intangible Assets, Useful Life	1 year 6 months
Backlog [Member]
Summary of identifiable intangible assets acquired and their respective weighted average lives
Intangible Assets, Assigned Value	$ 130
Intangible Assets, Useful Life	1 year