Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 UK	Dec. 31, 2012 UK Capital loss carryforwards	Dec. 31, 2012 German	Dec. 31, 2012 State
Operating loss carryforwards
Net operating loss carryforwards that expire at various dates						$ 200,672
Amount of tax credit carryforwards						1,799
Net operating loss carryforwards not subject to expiration					8,207
Capital loss carryforwards not subject to expiration				4,996
Net operating loss carryforwards utilized						3,866
Valuation allowance against net operating loss carryforwards					2,544	3,610
Valuation allowance against state credit carryforwards						235
Valuation allowance against deferred tax assets related to buildings	$ 14,621	$ 11,839	$ 7,847		$ 385