Discontinued Operations (Details) (USD $)	6 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assets [Abstract]
Assets held for sale		$ 203,000	$ 2,797,000
Liabilities [Abstract]
Other liabilities		0	267,000
Discontinued operations including amounts of operating revenue and income (loss) before income taxes [Abstract]
Operating revenues		1,091,000	10,516,000	12,929,000
Loss before income taxes		(496,000)	(904,000)	(1,179,000)
Impairment of long-lived assets held-for-use			600,000	1,900,000
Impairment of long lived assets held for use, net of tax			400,000	1,100,000
Number of properties transferred			5
Net book value of properties reclassified from discontinued operations			400,000
Adjustment to depreciation expense			100,000
Proceeds from sale of service contracts and related equipment	1,200,000	1,900,000	4,000,000
Proceeds placed in escrow		2,300,000	2,200,000
Amount to be collected from sales		100,000
Number of properties in process of ending relationship		5
Expected aggregate proceeds from divestiture of businesses		200,000
Converged Services [Member]
Assets [Abstract]
Property, plant and equipment, net		203,000	2,424,000
Other assets		0	373,000
Assets held for sale		203,000	2,797,000
Liabilities [Abstract]
Other liabilities		$ 0	$ 267,000