Operations and Summary of Significant Accounting Policies (Details 3) (USD $)	3 Months Ended								12 Months Ended			1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Facility closing	Sep. 30, 2013 Facility closing	Mar. 31, 2013 Facility closing	Sep. 30, 2013 Facility closing	Dec. 31, 2013 Facility closing	Dec. 31, 2012 Facility closing	Dec. 31, 2013 Facility closing Maximum	Dec. 31, 2012 Facility closing Land and building
Plant Closure
Net book value of the long-lived assets, including land, building and equipment	$ 209,533,000				$ 213,452,000				$ 209,533,000	$ 213,452,000			$ 1,700,000		$ 1,700,000		$ 2,800,000		$ 2,700,000
Impairment loss on assets held and in use														1,000,000
Sales of assets									5,262,000	7,642,000	3,081,000		1,000,000
Gain (loss) on sale of assets	(1,404,000)	(631,000)	(11,000)	8,000	(124,000)	(33,000)	13,000	(23,000)	(2,038,000)	(166,000)	(191,000)		(700,000)
Net book value of remaining equipments to be sold, transferred or scrapped					593,000					593,000			100,000		100,000
Severance costs																0	3,000,000
Severance costs paid															300,000		2,400,000
Severance costs accrued																	600,000
Severance costs reversed															200,000
Severance costs to be paid in 2014																		100,000
Plant closure expenses																100,000	300,000
Plant closure expenses paid																200,000	200,000
Reclassification from accumulated other comprehensive income to consolidated statement of operations related to foreign exchange losses												$ 2,800,000