Acquisitions - Allocation of the purchase price and the estimated non-deductible goodwill and other intangibles (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jul. 09, 2012 Palsticos Novel S.A. [Member]	Oct. 02, 2012 Jamco [Member]
Assets acquired:
Cash				$ 630	$ 88
Accounts receivable				5,467	1,690
Inventory				5,993	3,282
Property, plant & equipment				13,636	2,559
Intangibles				5,790	5,680
Deferred tax assets				435	28
Prepaid assets				1,451	48
Other				719	2
Assets acquired				33,491	13,289
Liabilities assumed:
Accounts payable and accruals				3,134	1,436
Other taxes				3,608	676
Other long-term obligations				2,293	454
Debt				26,028	0
Deferred income taxes				3,804	3,044
Liabilities assumed				38,867	5,610
Goodwill	61,056	44,666	40,892	8,805	7,435
Total consideration, less cash acquired				$ 3,429	$ 15,114