Income Taxes	9 Months Ended
Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rates for the three months ended September 30, 2015 and 2014 were 30% and 39%, respectively. The effective tax rates for the nine months ended September 30, 2015 and 2014 were 34% and 40%, respectively. The effective tax rates for the three and nine months ended September 30, 2015 and 2014 differed from the federal statutory rate primarily due to state taxes, foreign taxes and non-deductible expenses, partially offset by the California R&D credit. The decrease in the Company's effective tax rates for the three and nine months ended September 30, 2015 as compared to the three and nine months ended September 30, 2014 was primarily attributable to lower tax reserves on uncertain tax positions following an IRS Appeals settlement in the fourth quarter of 2014. Gross unrecognized tax benefits were $41.1 million and $34.8 million as of September 30, 2015 and December 31, 2014, respectively. The gross unrecognized tax benefits, if recognized by the Company, will result in a reduction of approximately $33.7 million to the provision for income taxes thereby favorably impacting the Company’s effective tax rate. The Company’s unrecognized tax benefits are primarily classified as “Accrued expenses” on the Consolidated Balance Sheets as of September 30, 2015. The Company includes interest and penalties related to unrecognized tax benefits within the "Provision for income taxes" on the Consolidated Statements of Operations. As of September 30, 2015, the total amount of gross interest and penalties accrued was $0.5 million, and is primarily classified as “Accrued expenses” on the Consolidated Balance Sheets. Deferred tax assets include $20.2 million and $13.4 million classified as “Other current assets” and $170.7 million and $106.9 million classified as “Other non-current assets” on the Consolidated Balance Sheets as of September 30, 2015 and December 31, 2014, respectively. In evaluating its ability to realize the net deferred tax assets, the Company considered all available positive and negative evidence, including its past operating results and the forecast of future market growth, forecasted earnings, future taxable income, and prudent and feasible tax planning strategies. As of September 30, 2015 and December 31, 2014, it was considered more likely than not that all deferred tax assets would be realized. Income tax benefits attributable to the exercise of employee stock options are recorded in additional paid-in-capital. These benefits amounted to $37.7 million and $21.0 million, during the three months ended September 30, 2015 and 2014, respectively and $105.6 million and $68.1 million, during the nine months ended September 30, 2015 and 2014, respectively. The Company files U.S. federal, state and foreign tax returns. The Company is currently under examination by the IRS for the years 2010 through 2013. During the third quarter ending September 30, 2015, the Company reached a tentative settlement with the IRS and expects to reach a final settlement within the next twelve months, at which time the tax reserves on the related uncertain tax position will be adjusted. The Company has reclassified the tax reserves related to these years from "Other non-current liabilities" to "Accrued expenses" on the Consolidated Balance Sheets. The year 2014 remains subject to examination by the IRS. The Company is also currently under examination by the state of California for the years 2006 and 2007. The state of California has completed its Field Exam and has issued a Notice of Proposed Assessment primarily related to the Company's R&D Credits claimed in those years. The Company has filed a protest against the proposed assessment. During the third quarter ending September 30, 2015, the Company has reached a tentative settlement with the Franchise Tax Board for tax years 1997 - 2007 and expects to reach a final settlement within the next twelve months, at which time the tax reserves on the related uncertain tax position will be adjusted. The Company has reclassified the tax reserves related to these years from "Other non-current liabilities" to Accrued expenses" on the Consolidated Balance Sheets. The years 2008 through 2013 remain subject to examination by the state of California. The Company has no significant foreign jurisdiction audits underway. The years 2011 through 2014 remain subject to examination by foreign jurisdictions. Given the potential outcome of the current examinations, as well as the impact of the current examination on the potential expiration of the statute of limitations, it is reasonably possible that the balance of unrecognized tax benefits could significantly change within the next twelve months. However, at this time, an estimate of the range of reasonably possible adjustments to the balance of unrecognized tax benefits cannot be made.

Income Taxes

The effective tax rates for the three months ended September 30, 2015 and 2014 were 30% and 39%, respectively. The effective tax rates for the nine months ended September 30, 2015 and 2014 were 34% and 40%, respectively. The effective tax rates for the three and nine months ended September 30, 2015 and 2014 differed from the federal statutory rate primarily due to state taxes, foreign taxes and non-deductible expenses, partially offset by the California R&D credit.

The decrease in the Company's effective tax rates for the three and nine months ended September 30, 2015 as compared to the three and nine months ended September 30, 2014 was primarily attributable to lower tax reserves on uncertain tax positions following an IRS Appeals settlement in the fourth quarter of 2014.

Gross unrecognized tax benefits were $41.1 million and $34.8 million as of September 30, 2015 and December 31, 2014, respectively. The gross unrecognized tax benefits, if recognized by the Company, will result in a reduction of approximately $33.7 million to the provision for income taxes thereby favorably impacting the Company’s effective tax rate. The Company’s unrecognized tax benefits are primarily classified as “Accrued expenses” on the Consolidated Balance Sheets as of September 30, 2015. The Company includes interest and penalties related to unrecognized tax benefits within the "Provision for income taxes" on the Consolidated Statements of Operations. As of September 30, 2015, the total amount of gross interest and penalties accrued was $0.5 million, and is primarily classified as “Accrued expenses” on the Consolidated Balance Sheets.

Deferred tax assets include $20.2 million and $13.4 million classified as “Other current assets” and $170.7 million and $106.9 million classified as “Other non-current assets” on the Consolidated Balance Sheets as of September 30, 2015 and December 31, 2014, respectively. In evaluating its ability to realize the net deferred tax assets, the Company considered all available positive and negative evidence, including its past operating results and the forecast of future market growth, forecasted earnings, future taxable income, and prudent and feasible tax planning strategies. As of September 30, 2015 and December 31, 2014, it was considered more likely than not that all deferred tax assets would be realized.

Income tax benefits attributable to the exercise of employee stock options are recorded in additional paid-in-capital. These benefits amounted to $37.7 million and $21.0 million, during the three months ended September 30, 2015 and 2014, respectively and $105.6 million and $68.1 million, during the nine months ended September 30, 2015 and 2014, respectively.

The Company files U.S. federal, state and foreign tax returns. The Company is currently under examination by the IRS for the years 2010 through 2013. During the third quarter ending September 30, 2015, the Company reached a tentative settlement with the IRS and expects to reach a final settlement within the next twelve months, at which time the tax reserves on the related uncertain tax position will be adjusted. The Company has reclassified the tax reserves related to these years from "Other non-current liabilities" to "Accrued expenses" on the Consolidated Balance Sheets. The year 2014 remains subject to examination by the IRS.

The Company is also currently under examination by the state of California for the years 2006 and 2007. The state of California has completed its Field Exam and has issued a Notice of Proposed Assessment primarily related to the Company's R&D Credits claimed in those years. The Company has filed a protest against the proposed assessment. During the third quarter ending September 30, 2015, the Company has reached a tentative settlement with the Franchise Tax Board for tax years 1997 - 2007 and expects to reach a final settlement within the next twelve months, at which time the tax reserves on the related uncertain tax position will be adjusted. The Company has reclassified the tax reserves related to these years from "Other non-current liabilities" to Accrued expenses" on the Consolidated Balance Sheets. The years 2008 through 2013 remain subject to examination by the state of California.

The Company has no significant foreign jurisdiction audits underway. The years 2011 through 2014 remain subject to examination by foreign jurisdictions. Given the potential outcome of the current examinations, as well as the impact of the current examination on the potential expiration of the statute of limitations, it is reasonably possible that the balance of unrecognized tax benefits could significantly change within the next twelve months. However, at this time, an estimate of the range of reasonably possible adjustments to the balance of unrecognized tax benefits cannot be made.