Comprehensive Income (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Comprehensive Income [Abstract]
Foreign currency translation adjustments	$ 31,500,000	$ 29,900,000
Unrecognized pension costs	72,000,000	(77,500,000)
Net gain (loss) on cash flow hedges	2,700,000	2,300,000
Accumulated other comprehensive income (loss)	$ (37,783,000)	$ (45,331,000)