Debt (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Short-term Debt [Line Items]
Loans payable and current portion of long-term debt	$ 45,868,000	$ 11,241,000
Domestic accounts receivable asset securitization program [Member]
Short-term Debt [Line Items]
Maximum available in form of cash or letter of credit	50,000,000
Loans payable and current portion of long-term debt	30,000,000
Accounts receivable securing advances	110,200,000
Debt instrument, basis spread on variable Federal Funds Rate	0.50%
Additional availability under programs	20,000,000
Interest rate	0.60%
International accounts receivable sales with recourse programs [Member]
Short-term Debt [Line Items]
Loans payable and current portion of long-term debt	6,486,000	8,150,000
Accounts receivable securing advances	14,400,000
Commitments supporting international programs	17,700,000
Additional availability under programs	$ 5,700,000
Interest rate terms, basis	EURIBOR
Interest rate terms, rate	1.75%
Weighted-average interest rate	2.10%