Subsequent Events (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011 employees	Jun. 30, 2012 Tenco Acquisition of Tenco Group Inc	Jun. 30, 2012 Tenco Acquisition of Tenco Group Inc	Oct. 18, 2011 Tenco Acquisition of Tenco Group Inc
Subsequent Event [Line Items]
Cost of acquisition of Tenco Group, Inc, Cash Paid								$ 5,900,000
Revenue generated by Tenco	167,009,000	160,824,000	322,920,000	301,539,000		5,700,000	15,100,000
Net income of Tenco						100,000	400,000
Restructuring Charges					$ 700,000
Number of employees affected by consolidation (employees)					77