Quarterly Results of Operations (Unaudited) (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012
Quarterly Results of Operations (Unaudited) (Additional Textual) [Abstract]
Elimination of Valuation allowances of deferred assets after tax	$ 7,257
Quarterly Results of Operations Unaudited (Textual) [Abstract]
Deconsolidating gains								209	0
Deconsolidation gains after tax								840
Foreign exchange losses on intercompany loans					854	1,357	304	851
Foreign exchange losses on intercompany loans after tax	826	659	1,109	734	854	1,357	304	851
Impairment charges	967
Wellington Plant [Member]
Quarterly Results of Operations (Unaudited) (Additional Textual) [Abstract]
Start-up costs					500	1,000	2,000	2,500
Start-up costs after tax					500	1,000	2,000	2,500
Elimination of Valuation allowances of deferred assets after tax					$ 770