Acquisitions (Details) (USD $)	9 Months Ended		0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Mar. 01, 2012 IdeaOne Telecom [Member]
Business Acquisition [Line Items]
Business Acquisition, cost of acquired entity, total purchase price	$ 0	$ 26,337,000	$ 26,337,000
Business Acquisition, cost of acquired entity, cash paid			4,337,000
Business Acquisition, cost of acquired entity, liabilities incurred			22,000,000
Business Acquisition, liabilities assumed and paid			$ 1,843,000