Long-Term Debt (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Aug. 03, 2012	Aug. 31, 2011
Long-Term Debt (Textual) [Abstract]
Increased revolving credit facility			$ 125,000,000
Long-Term Debt (Additional Textual) [Abstract]
Long-term debt	158,000,000	144,500,000
Term loan			170,000,000	140,000,000
Credit agreement date	Aug. 03, 2012
Loan installments	4,300,000
Borrowing base percentage against receivables	85.00%
Euro currency rate applicable margin range, Minimum	2.00%
Euro currency Rate applicable margin range, Maximum	3.80%
Outstanding letters of credit	9,400,000
Average interest rate on credit agreement	2.70%
Minimum [Member]
Long-Term Debt (Textual) [Abstract]
Base Rate applicable margin range	1.50%
Maximum [Member]
Long-Term Debt (Textual) [Abstract]
Base Rate applicable margin range	2.80%
Revolving credit facility [Member]
Long-Term Debt (Textual) [Abstract]
Revolving credit facility				100,000,000
Issuance in letters of credit	25,000,000
Total availability under revolving credit facility	$ 93,600,000