Restructuring (Details) (USD $)	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	Dec. 31, 2011	Dec. 31, 2010
Facility Consolidation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring accrual	$ 3,600,000								$ 3,600,000
Administrative consolidation costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuing charges									6,497,000	792,000	2,176,000
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuing charges									7,052,000	3,467,000	4,886,000
Cost of Sales [Member] | Facility Consolidation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuing charges	2,500,000	1,800,000	1,200,000	1,500,000	900,000	800,000	1,000,000	800,000	7,052,000	3,467,000	2,397,000
Cost of Sales [Member] | Termination of a product offering [Member]
Restructuring Cost and Reserve [Line Items]
Restructuing charges									0	0	2,489,000
Other Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuing charges									6,497,000	792,000	2,176,000
Other Expense [Member] | Administrative consolidation costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuing charges	$ 3,100,000	$ 1,900,000	$ 1,200,000	$ 300,000			$ 100,000	$ 700,000	$ 6,497,000	$ 792,000	$ 2,176,000