Income Taxes (Reconciliation of the Company's Effective Tax Rate to the Statutory Federal Rate) (Details)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory taxes	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	1.20%	1.20%	1.90%
Foreign operations	(13.80%)	(14.80%)	(10.20%)
Permanent differences	3.30%	(1.10%)	(2.00%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Liability, Acquired Intangibles, Percent	(5.90%)	0.00%	0.00%
Tax credits	(13.70%)	(10.90%)	(4.70%)
Stock option compensation	1.90%	0.40%	0.10%
Change in accruals for uncertain tax positions	(0.30%)	3.30%	(5.30%)
Other	1.00%	(0.60%)	(0.70%)
Effective income tax rate	8.70%	12.50%	14.10%

Effective Income Tax Rate Reconciliation, Change in Deferred Tax Liability, Acquired Intangibles, Percent

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Effective Income Tax Rate Reconciliation, Permanent Differences, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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