Liquidity (Details) (USD $) In Thousands, unless otherwise specified	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	Dec. 31, 2009
(Loss) income from continuing operations	$ (6,737)	$ (2,193)	$ (5,595)	$ (3,138)	$ (578)	$ (1,330)	$ (1,621)	$ (57)	$ (17,663)	$ (3,586)	$ 1,421
Cash and cash equivalents	8,319				16,917				8,319	16,917	21,391	16,495
Net Cash Provided by (Used in) Operating Activities, Continuing Operations									(4,177)	786	9,350
Captial expenditures									4,103	4,821	4,346
Revenues	38,391	33,671	35,401	38,792	40,827	38,157	37,928	40,577	146,255	157,489	166,370
Revenue Decline									(7.10%)
Impairment of long-lived assets									5,314
Portamedic [Member]
Impairment of long-lived assets									$ 4,900