Business Combination (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2013 Customer relationships	Dec. 31, 2012 Customer relationships	Dec. 31, 2013 GVT Acquisition	Jul. 02, 2012 GVT Acquisition	Jul. 02, 2012 GVT Acquisition Customer relationships
Business Acquisition [Line Items]
Business Combination, Consideration Transferred									$ 2,400,000
Business Combination, Cash Payment Offset									1,000,000
Acquisition legal and accounting fees								400,000
Business Combinations [Abstract]
Identifiable net assets									500,000	500,000
Goodwill	29,103,000	[1],[2]	29,022,000	[1],[2]					1,867,000
Total purchase price allocation									2,367,000
Amortization expense	$ 300,000		$ 700,000		$ 1,400,000	$ 300,000	$ 100,000

[1] $2.0 million of goodwill is related to a 2012 acquisition.

[2] Difference in goodwill value between these dates is solely due to a foreign currency translation adjustment.