Restructuring (Narrative) (Details) (USD $)	36 Months Ended					12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Oct. 20, 2008	Dec. 31, 2009 CompAir Holdings Limited [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges in connection with consolidation of U.S operations	$ 8,700,000
Restructuring reserve, CompAir	4,482,000	6,043,000	20,980,000	15,999,000	8,900,000
Restructuring reserve, liability increase						$ 2,100,000