Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Countries	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Line Items]
Tax effect of adjustment due to a prior year error		$ (3,553,000)
Number of countries in which opertions constitute a taxable presence	16
Net decrease in valuation allowance	(3,100,000)
Net operating loss carryforwards	633,800,000
Net operating loss carryforwards, deferred tax asset	80,000,000
Unrepatriated foreign earnings	1,500,000
Non-U.S. earnings that have been targeted for future repatriation	19,400,000
Foreign earnings expected to be distributed	12,100,000
Income tax expense recorded due to expected repatriation of foreign earnings	500,000
Accumulated undistributed earnings intended to remain permanently invested	375,000,000
Amounts of tax benefits that would affect effective tax rate if recognized	24,400,000
Recognized interest and penalties related to uncertain tax positions	(6,400,000)	1,100,000	300,000
Interest and penalties related to settlement of audits	(4,400,000)
Accrued interest and penalties related to uncertain tax positions	1,400,000	7,600,000
Estimated range of change, upper bound	0
Estimated range of change, lower bound	(13,900,000)
Unrecognized tax benefits	24,386,000	27,053,000	23,467,000	22,513,000
Taxes paid, net of refunds	15,100,000	13,700,000	9,200,000
Minimum [Member]
Income Tax Disclosure [Line Items]
Open tax years	2000
Maximum [Member]
Income Tax Disclosure [Line Items]
Open tax years	2012
Research Member
Income Tax Disclosure [Line Items]
Tax credit carryforward	7,000,000
Research Member | Minimum [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforwards, expiration date	Jan. 01, 2023
Alternative Minimum Tax [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward	1,300,000
U.S. [Member]
Income Tax Disclosure [Line Items]
Net deferred tax asset	71,809,000	81,862,000
State and Local Jurisdiction [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	31,400,000
Non-U.S. [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforward	19,200,000
Net deferred tax asset	7,376,000	6,398,000
Non-U.S. [Member] | Minimum [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforwards, expiration date	Jan. 01, 2015
German Tax Authority [Member]
Income Tax Disclosure [Line Items]
Unrecognized tax benefits	22,500,000
Payment to taxing authority to pursue litigation			13,200,000
German Tax Authority [Member] | Minimum [Member]
Income Tax Disclosure [Line Items]
Years examined	2000
German Tax Authority [Member] | Maximum [Member]
Income Tax Disclosure [Line Items]
Years examined	2003
Tax Attributes With Limited Lives [Member] | U.S. [Member]
Income Tax Disclosure [Line Items]
Net deferred tax asset	$ 28,500,000