Income Taxes (Narrative) (Details) (USD $)	12 Months Ended			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Foreign Country [Member]	Dec. 15, 2011 Robuschi SpA [Member]
Income Tax Examination [Line Items]
Unrecognized tax benefits	$ 5,296,000	$ 4,510,000	$ 5,238,000		$ 2,400,000
Uncertain tax positions that would affect the effective tax rate if recognized	5,300,000	4,500,000
Offsetting reduction of a corresponding deferred tax asset	1,500,000	2,300,000
Interest and penalties	400,000	400,000	500,000
Accrued interest	200,000	700,000
Penalties	0	300,000
Income tax jurisdictions outside U.S.				30
Subsidiaries under audit in Germany	15
Deferred tax assets associated with net operating loss and interest carryforwards	26,952,000	32,375,000
Carryforwards related to interest expense unable to be deducted from current period income	12,400,000	11,000,000
Valuation allowances associated with net operating loss carryforwards	11,760,000	19,687,000
Deferred income taxes on undistributed earnings of non-U.S. subsidiaries	$ 449,400,000	$ 400,400,000