Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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+ Details

Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Materials And Supplies [Member]	Dec. 31, 2012 Materials And Supplies [Member]	Jun. 30, 2013 Company's Revenues [Member]	Jun. 30, 2012 Company's Revenues [Member]	Jun. 30, 2013 Company's Revenues [Member]	Jun. 30, 2012 Company's Revenues [Member]	Jun. 30, 2013 Unified Communications [Member]
Concentration Risk [Line Items]
Cost adjustment period	2 years
Percentage of regulatory revenue					5.00%	8.00%	6.00%	8.00%
Goodwill	$ 9,121	$ 9,121							$ 9,100
Other current assets	$ 1,682	$ 1,844	$ 400	$ 500