Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Taxes (Textuals) [Abstract]
Income tax expense	$ 4,029,000	$ 3,362,000
Gross unrecognized tax benefits	8,700,000		8,200,000
Unrecognized tax benefits that would impact effective tax rate	6,500,000
U.S. [Member]
Income Taxes (Textuals) [Abstract]
Operating loss carryforwards	367,600,000
Operating loss carryforwards, expiration dates	at various times through 2031
Non-U.S. [Member]
Income Taxes (Textuals) [Abstract]
Operating loss carryforwards	83,500,000
Operating loss carryforwards, expiration dates	at various times through 2023
Application of a Law Change [Member]
Income Taxes (Textuals) [Abstract]
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	$ 500,000