Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	$ 34,400
Operating Loss Carryforwards	190,000
Deferred Tax Assets, Operating Loss Carryforwards	39,000
Deferred Tax Assets, Valuation Allowance	29,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	6,798	4,975	7,484
Second component of tax deductible goodwill, net of tax	1,600
Unrecognized Tax Benefits	17,099	26,333
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	1,388
Deferred tax asset, Uncertain tax position	3,760
Interest expense net of deferred tax benefit	786
Interest Income, Other	1,225
Tax Year 2008 [Member]
Income Tax Contingency [Line Items]
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	1,381
Tax Years 2009 through 2013 [Member]
Income Tax Contingency [Line Items]
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	$ 2,109