Selected Quarterly Financial Data (Unaudited) (Narrative) (Details) (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	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Impairment of goodwill					$ 60,302				$ 0	$ 60,302	$ 0
Costs associated with legal arbitration			500	1,000					1,555	0	0
Administrative consolidation costs [Member]
Segment Reporting Information [Line Items]
Restructuing charges									6,497	792	2,176
Cost of Sales [Member]
Segment Reporting Information [Line Items]
Restructuing charges									7,052	3,467	4,886
Cost of Sales [Member] | Facility Consolidation Costs [Member]
Segment Reporting Information [Line Items]
Restructuing charges	2,500	1,800	1,200	1,500	900	800	1,000	800	7,052	3,467	2,397
Other Expense [Member]
Segment Reporting Information [Line Items]
Restructuing charges									6,497	792	2,176
Other Expense [Member] | Administrative consolidation costs [Member]
Segment Reporting Information [Line Items]
Restructuing charges	3,100	1,900	1,200	300			100	700	6,497	792	2,176
Distributor [Member]
Segment Reporting Information [Line Items]
Costs associated with purchase				700	300				704	300	0
Business [Member]
Segment Reporting Information [Line Items]
Costs associated with purchase	500	700							1,194	0	0
Business [Member] | Other Expense [Member]
Segment Reporting Information [Line Items]
Costs associated with purchase									$ 1,200