Debt (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt obligations [Abstract]
Revolving credit agreement	$ 31,580	$ 52,495
Other	93	1,190
Total	57,902	82,986
Less amounts due in one year or less	(1,266)	(4,262)
Non-current portion of long term debt	56,636	78,724
Annual maturities of debt obligations [Abstract]
2014	1,266
2015	37
2016	19
2017	31,580
2018	0
Thereafter	25,000
Line of Credit Facility [Line Items]
Multiemployer pension withdrawal liability		31,683
Deferred Financing Fees [Abstract]
Unamortized deferred financing fees	671
Amortization of deferred financing fees	262	301	606
Belgium Production Equipment financing [Member]
Line of Credit Facility [Line Items]
Period of debt instrument	3 years
New borrowings	110
Last payments installments due date	June 30, 2016
Credit Agreement 2012 [Member]
Line of Credit Facility [Line Items]
Term of revolving credit facility		5 years
Multicurrency revolving credit facility, maximum borrowing capacity		125,000
Maximum basis spread on LIBOR borrowings (in hundredths)		2.25%
Optional increase in amount of Credit Agreement, maximum		50,000
Minimum number of new commitments to be obtained to increase the Credit Agreement		1
Basis spread on reference rate (in hundredths)		1.75%
LIBOR Borrowing [Member]
Line of Credit Facility [Line Items]
Interest rate (in hundredths)	1.88%
Amount outstanding	25,000
Prime Rate Borrowings [Member]
Line of Credit Facility [Line Items]
Interest rate (in hundredths)	4.00%
Basis spread on reference rate (in hundredths)	1.50%
Amount outstanding	6,300
Bankers Acceptance Agreements Borrowing [Member] | Canadian Subsidiary [Member]
Line of Credit Facility [Line Items]
Interest rate (in hundredths)	3.75%
Amount outstanding	280
Private shelf facility agreement [Member]
Line of Credit Facility [Line Items]
Multicurrency revolving credit facility, maximum borrowing capacity		75,000
Period of debt instrument		3 years
Maximum number of maturities years under Shelf Facility		10 years
Notice period to terminate the unused portion		30 days
Series F Senior Note [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount		25,000
Debt instrument, interest rate, stated percentage (in hundredths)		4.38%
Debt instrument, maturity date		Jan. 27, 2019
Swing-line Loan [Member] | Credit Agreement 2012 [Member]
Line of Credit Facility [Line Items]
Multicurrency revolving credit facility, maximum borrowing capacity		10,000
Letters of Credit [Member] | Credit Agreement 2012 [Member]
Line of Credit Facility [Line Items]
Multicurrency revolving credit facility, maximum borrowing capacity		10,000
Series A senior note payable - Tranche A [Member]
Debt obligations [Abstract]
Senior note payable	0	1,843
Series A senior note payable - Tranche B [Member]
Debt obligations [Abstract]
Senior note payable	1,229	2,458
Series F senior note payable [Member]
Debt obligations [Abstract]
Senior note payable	25,000	25,000
Belgium Production Equipment financing [Member]
Debt obligations [Abstract]
Balance outstanding	93
Amount included in in current portion of long-term debt	37
Non-current portion of long term debt	56
Senior Notes [Member]
Debt obligations [Abstract]
Total	$ 1,229
Interest rate (in hundredths)	8.98%