Income Taxes	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is subject to U.S. federal, foreign, state and local corporate income taxes and its effective tax rate varies depending on the jurisdiction in which the income is earned. Effective in 2017, the Company was subject to a new accounting pronouncement which requires it to record a charge or benefit in its income tax provision for the tax effect of the difference between the grant date value of restricted stock units and the market value of such awards at the time of vesting. The provisions for income taxes for the six months ended June 30, 2018 and 2017 include net charges of $4.4 million and $1.5 million, respectively, related to the tax effect of the vesting of restricted stock units at a market value below their grant price. In December 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was enacted and made significant changes to U.S. corporate income tax laws by, among other things, lowering the corporate income tax rate from 35% to 21% beginning in 2018 and implementing a territorial-type tax system with a minimum tax for certain foreign earnings beginning in 2018. Under the current accounting requirements, the Company revalued its deferred tax assets and liabilities using the lower corporate rate as of the effective date of the legislation in 2017. In addition, the Company did not incur a one-time repatriation toll charge associated with the implementation of the territorial-type system because it was allowed to offset cumulative foreign losses in some of its jurisdictions against the cumulative foreign earnings in other jurisdictions. Based on the Company's historical taxable income and its expectation for taxable income in the future, management expects that its largest deferred tax asset, which relates principally to compensation expense deducted for book purposes but not yet deducted for tax purposes, will be realized as offsets to future taxable income. Any gain or loss resulting from the translation of deferred taxes for foreign affiliates is included in the foreign currency translation adjustment incorporated as a component of other comprehensive income (loss), net of tax, in the condensed consolidated statements of changes in stockholders' equity and the condensed consolidated statements of comprehensive income. The Company is subject to the income tax laws of the United States, its states and municipalities, and those of the foreign jurisdictions in which the Company operates. These laws are complex, and the manner in which they apply to the taxpayer's facts is sometimes open to interpretation. Management must make judgments in assessing the likelihood that a tax position will be sustained upon examination by the taxing authorities based on the technical merits of the tax position. In the normal course of business, the Company may be under audit in one or more of its jurisdictions in an open tax year for that particular jurisdiction. As of June 30, 2018, the Company does not expect any material changes in its tax provision related to any current or future audits.

Income Taxes

The Company is subject to U.S. federal, foreign, state and local corporate income taxes and its effective tax rate varies depending on the jurisdiction in which the income is earned.

Effective in 2017, the Company was subject to a new accounting pronouncement which requires it to record a charge or benefit in its income tax provision for the tax effect of the difference between the grant date value of restricted stock units and the market value of such awards at the time of vesting. The provisions for income taxes for the six months ended June 30, 2018 and 2017 include net charges of $4.4 million and $1.5 million, respectively, related to the tax effect of the vesting of restricted stock units at a market value below their grant price.

In December 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was enacted and made significant changes to U.S. corporate income tax laws by, among other things, lowering the corporate income tax rate from 35% to 21% beginning in 2018 and implementing a territorial-type tax system with a minimum tax for certain foreign earnings beginning in 2018. Under the current accounting requirements, the Company revalued its deferred tax assets and liabilities using the lower corporate rate as of the effective date of the legislation in 2017. In addition, the Company did not incur a one-time repatriation toll charge associated with the implementation of the territorial-type system because it was allowed to offset cumulative foreign losses in some of its jurisdictions against the cumulative foreign earnings in other jurisdictions.

Based on the Company's historical taxable income and its expectation for taxable income in the future, management expects that its largest deferred tax asset, which relates principally to compensation expense deducted for book purposes but not yet deducted for tax purposes, will be realized as offsets to future taxable income.

Any gain or loss resulting from the translation of deferred taxes for foreign affiliates is included in the foreign currency translation adjustment incorporated as a component of other comprehensive income (loss), net of tax, in the condensed consolidated statements of changes in stockholders' equity and the condensed consolidated statements of comprehensive income.

The Company is subject to the income tax laws of the United States, its states and municipalities, and those of the foreign jurisdictions in which the Company operates. These laws are complex, and the manner in which they apply to the taxpayer's facts is sometimes open to interpretation. Management must make judgments in assessing the likelihood that a tax position will be sustained upon examination by the taxing authorities based on the technical merits of the tax position. In the normal course of business, the Company may be under audit in one or more of its jurisdictions in an open tax year for that particular jurisdiction. As of June 30, 2018, the Company does not expect any material changes in its tax provision related to any current or future audits.