Income Taxes (Narrative) (Details) (USD $)	3 Months Ended				12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Maximum [Member]	Dec. 31, 2012 German Tax Authority [Member]	Mar. 31, 2013 German Tax Authority [Member]
Income Tax Disclosure [Line Items]
Estimated tax rate	34.00%	(6.50%)
Unrepatriated foreign earnings	$ 1,500,000
Non-U.S. earnings that have been targeted for future repatriation	19,400,000
Open tax years			2000	2012
Estimated range of change, upper bound	0
Estimated range of change, lower bound	(800,000)
Unrecognized tax benefits						22,300,000
Amounts of tax benefits that would affect effective tax rate if recognized						11,400,000
Payment to taxing authority to pursue litigation					$ 12,800,000