INCOME TAXES	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES In determining its interim provision for/(benefit from) income taxes, the Company uses an estimated annual effective tax rate, which is based on expected annual profit before tax, statutory tax rates and tax planning opportunities available in the various jurisdictions in which the Company operates. Certain significant or unusual items are separately recognized in the quarter in which they occur and can be a source of variability in the effective tax rates from quarter to quarter. The Company’s worldwide effective tax rate for the three months ended June 30, 2018 and 2017 was 12.0% and 13.2%, respectively, and (9.2)% and 14.9% during the six months ended June 30, 2018 and 2017, respectively. The interim provision for/(benefit from) income taxes in the three and six months ended June 30, 2018 was favorably impacted by the recognition of $706 and $25,340, respectively, of net deferred tax assets as a result of the election to disregard as separate entities for U.S. tax purposes certain foreign subsidiaries of the Company. In addition, the Company recorded excess tax benefits upon vesting or exercise of stock-based awards of $5,440 and $4,138 during the three months ended June 30, 2018 and 2017, respectively, and $10,130 and $5,832 during the six months ended June 30, 2018 and 2017, respectively. Due to the timing of the enactment and the complexity involved in applying the provisions of the Tax Cuts and Jobs Act (“U.S. Tax Act”), the Company has made reasonable estimates of the effects and recorded provisional amounts in its interim financial statements as of June 30, 2018. As the Company collects and prepares necessary data and interprets the U.S. Tax Act and any additional guidance issued by the U.S. Treasury Department, the IRS, and other standard-setting bodies, and further refines the calculations, the Company may make adjustments to the provisional amounts recorded. During the three months ended March 31, 2018, the Company further refined its estimate and recorded a provisional $2,157 increase in its income taxes payable associated with the one-time transition tax on accumulated foreign subsidiary earnings not previously subject to U.S. income tax which now totals $66,478. Of this amount, $55,841 is classified as Taxes payable, noncurrent as of June 30, 2018. No adjustments were recorded to the provisional income tax payable associated with the one-time transition tax during the three months ended June 30, 2018. The Company expects to complete its analysis during the second half of 2018. Any adjustments during this measurement period will be included in the provision for income taxes in the reporting period when such adjustments are determined. The U.S. Tax Act subjects a U.S. shareholder to tax on global intangible low-taxed income (“GILTI”) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred. During the six months ended June 30, 2018, the Company elected to provide for the tax expense related to GILTI in the year the tax is incurred. This election did not have a material impact on the interim financial statements for the three and six months ended June 30, 2018.

INCOME TAXES

In determining its interim provision for/(benefit from) income taxes, the Company uses an estimated annual effective tax rate, which is based on expected annual profit before tax, statutory tax rates and tax planning opportunities available in the various jurisdictions in which the Company operates. Certain significant or unusual items are separately recognized in the quarter in which they occur and can be a source of variability in the effective tax rates from quarter to quarter.

The Company’s worldwide effective tax rate for the three months ended June 30, 2018 and 2017 was 12.0% and 13.2%, respectively, and (9.2)% and 14.9% during the six months ended June 30, 2018 and 2017, respectively.

The interim provision for/(benefit from) income taxes in the three and six months ended June 30, 2018 was favorably impacted by the recognition of $706 and $25,340, respectively, of net deferred tax assets as a result of the election to disregard as separate entities for U.S. tax purposes certain foreign subsidiaries of the Company. In addition, the Company recorded excess tax benefits upon vesting or exercise of stock-based awards of $5,440 and $4,138 during the three months ended June 30, 2018 and 2017, respectively, and $10,130 and $5,832 during the six months ended June 30, 2018 and 2017, respectively.

Due to the timing of the enactment and the complexity involved in applying the provisions of the Tax Cuts and Jobs Act (“U.S. Tax Act”), the Company has made reasonable estimates of the effects and recorded provisional amounts in its interim financial statements as of June 30, 2018. As the Company collects and prepares necessary data and interprets the U.S. Tax Act and any additional guidance issued by the U.S. Treasury Department, the IRS, and other standard-setting bodies, and further refines the calculations, the Company may make adjustments to the provisional amounts recorded. During the three months ended March 31, 2018, the Company further refined its estimate and recorded a provisional $2,157 increase in its income taxes payable associated with the one-time transition tax on accumulated foreign subsidiary earnings not previously subject to U.S. income tax which now totals $66,478. Of this amount, $55,841 is classified as Taxes payable, noncurrent as of June 30, 2018. No adjustments were recorded to the provisional income tax payable associated with the one-time transition tax during the three months ended June 30, 2018. The Company expects to complete its analysis during the second half of 2018. Any adjustments during this measurement period will be included in the provision for income taxes in the reporting period when such adjustments are determined.

The U.S. Tax Act subjects a U.S. shareholder to tax on global intangible low-taxed income (“GILTI”) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred. During the six months ended June 30, 2018, the Company elected to provide for the tax expense related to GILTI in the year the tax is incurred. This election did not have a material impact on the interim financial statements for the three and six months ended June 30, 2018.