Income Taxes - Uncertain Tax Positions - Narrative (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2015	Dec. 31, 2011
Uncertain Tax Positions [Abstract]
Unrecognized Tax Benefits	$ 11,845	$ 12,596	$ 12,410		$ 12,719
Accrued Interest	1,868	2,108
Accrued Penalties	1,845	2,100
Unrecognized Tax Benefits, Interest on Income Taxes Expense	(31)	(247)	(26)
Unrecognized Tax Benefits, Income Tax Penalties Expense	(26)	392	301
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound				1,900
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound				2,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 1,066	$ 1,194	$ 1,652
Internal Revenue Service (IRS) [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2011
Foreign Tax Authority [Member] | The Netherlands [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2008
Foreign Tax Authority [Member] | United Kingdom [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2009
Foreign Tax Authority [Member] | Brazil [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2000
Foreign Tax Authority [Member] | Spain [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	2010
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	2007
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Income Tax Examination, Year under Examination	1993