Income Taxes - Uncertain Tax Positions - Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Uncertain Tax Positions [Abstract]
Unrecognized Tax Benefits	$ 12,410	$ 12,719	$ 10,464	$ 10,686
Accrued Interest	2,288	2,268
Accrued Penalties	1,630	1,298
Unrecognized Tax Benefits, Interest on Income Taxes Expense	(26)	529	80
Unrecognized Tax Benefits, Income Tax Penalties Expense	301	502	(12)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	2,300
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	2,400
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 1,652	$ 2,966	$ 3,427
Internal Revenue Service (IRS) [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2009
Foreign Tax Authority [Member] | The Netherlands [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2006
Foreign Tax Authority [Member] | United Kingdom [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2007
Foreign Tax Authority [Member] | Brazil [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2008
Foreign Tax Authority [Member] | Spain [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2008
Foreign Tax Authority [Member] | China [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2010
Foreign Tax Authority [Member] | Italy [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2010
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	1993