Debt (Details) (USD $)	6 Months Ended		0 Months Ended	1 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	May 18, 2012 Revolving Credit Facility	Jun. 30, 2012 Revolving Credit Facility	Jun. 30, 2012 Revolving Credit Facility	Jun. 30, 2012 Revolving Credit Facility Other Assets [Member]	Jun. 30, 2012 Revolving Credit Facility Eurodollar Rate From May 18, 2012 to August 15, 2012	Jun. 30, 2012 Revolving Credit Facility Base Rate From May 18, 2012 to August 15, 2012	Jun. 30, 2012 Revolving Credit Facility Applicable Rate After August 15, 2012	Jun. 30, 2012 Domestic Line of Credit United States	Jun. 30, 2012 Foreign Line of Credit Europe
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding	$ 0
Maximum borrowing capacity				200,000,000	200,000,000					150,000,000	50,000,000
Current borrowing capacity										108,500,000	17,200,000
Basis spread on variable rate							2.00%	1.00%
Reduction in Basis Points from Credit Agreement Due to Average Daily Availability									1.25%
Consolidated fixed charge coverage ratio			1.20	1
Covenant liquidity requirement										30,000,000
Debt issuance costs capitalized					2,600,000
Payment of debt issuance costs	1,900,000	0			1,900,000
Debt issuance costs accrued						$ 700,000