Income Taxes	3 Months Ended
Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We account for income taxes under the asset and liability method. Under this method, deferred income tax assets and liabilities are determined based upon the difference between the financial statement carrying amounts and the tax basis of assets and liabilities and are measured using the enacted tax rate expected to apply to taxable income in the years in which the differences are expected to be reversed. We recognized a benefit from income taxes of $10.0 million for the three months ended March 31, 2016 and a provision for income taxes of $1.0 million for the three months ended March 31, 2015. The tax benefit for the three months ended March 31, 2016 is primarily due to the release of the U.S. valuation allowance on the U.S. deferred tax assets resulting from recording a deferred tax liability on the acquisition-related intangibles for which no benefit will be derived, partially offset by foreign and state income taxes. The tax provision for the three months ended March 31, 2015 is primarily due to foreign and state income taxes.

Income Taxes

3 Months Ended

Mar. 31, 2016

We account for income taxes under the asset and liability method. Under this method, deferred income tax assets and liabilities are determined based upon the difference between the financial statement carrying amounts and the tax basis of assets and liabilities and are measured using the enacted tax rate expected to apply to taxable income in the years in which the differences are expected to be reversed.

We recognized a benefit from income taxes of $10.0 million for the three months ended March 31, 2016 and a provision for income taxes of $1.0 million for the three months ended March 31, 2015. The tax benefit for the three months ended March 31, 2016 is primarily due to the release of the U.S. valuation allowance on the U.S. deferred tax assets resulting from recording a deferred tax liability on the acquisition-related intangibles for which no benefit will be derived, partially offset by foreign and state income taxes. The tax provision for the three months ended March 31, 2015 is primarily due to foreign and state income taxes.