Discontinued Operations (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Discontinued Operations
After-tax loss from discontinued operations	$ 592,000	$ (98,000)	$ 98,000	$ (237,000)	$ (2,532,000)	$ 45,000	$ (1,010,000)	$ (521,000)	$ 355,000	$ (4,018,000)	$ (6,547,000)
Goodwill impairment charge										57,354,000
Operation located in Delaware
Discontinued Operations
Impairment of intangible assets										1,600,000
After-tax loss from discontinued operations										4,000,000	6,500,000
Goodwill impairment charge											5,700,000
Income associated with the reduction of estimated liabilities associated with the sale and shutdown of previous discontinued operations									300,000
Revenue and pre-tax loss related to discontinued operations
Revenue									4,668,000	23,366,000	44,762,000
Pre-tax income (loss)									$ 567,000	$ (6,727,000)	$ (11,380,000)