Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Undistributed earnings from foreign subsidiaries	$ 253,673,000	$ 209,483,000	$ 177,458,000
Net operating loss carry forwards	118,000,000
Net operating loss carry forwards in foreign jurisdictions	42,700,000
Interest on tax positions	200,000
Accrued interest on tax positions	1,400,000
Asserted income tax deficiencies		13,100,000
Research [Member]
Tax credit carry forwards	60,300,000
Research [Member] | Foreign Subsidiaries [Member]
Undistributed earnings from foreign subsidiaries	$ 1,320,100,000