Deferred Tax Assets, Decrease Due To Enacted Tax Law

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- Definition

Foreign Income Tax Expense (Benefit), Amount To Be Recognized In Next Twelve Months

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

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

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- Definition

Amount of foreign earnings repatriated from subsidiaries outside the country of domicile.

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No definition available.

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- Definition

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

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- Definition

Amount 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 increase (decrease) in the income tax rates.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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- Definition

Amount of unrecognized tax benefits.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Jan. 29, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Federal statutory income tax rate, percent										35.00%	35.00%	35.00%
Provision for income taxes		$ 79,100								$ (73,608)	$ 73,829	$ 19,244
Change in enacted tax rate, amount										46,900
Foreign earnings repatriated										32,200
Revenues		3,285,755	$ 2,984,859	$ 2,785,464	$ 2,636,635	$ 2,477,541	$ 2,290,188	$ 2,105,204	$ 1,957,736	11,692,713	8,830,669	6,779,511
Foreign income tax expense (benefit)										66,500
Valuation allowance		49,431				1,601				49,431	1,601
Deferred tax assets		46,900								46,900
Federal foreign tax credits		102,242				0				102,242	0
Unrecognized tax benefits		42,902				19,739				42,902	19,739	$ 17,117
Reduction in provision for income taxes due to impact of effective tax rate		37,900				$ 17,000				37,900	$ 17,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount		133,400								133,400
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount		119,200								119,200
Internal Revenue Service (IRS) [Member] \| Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		80,900								80,900
Accounting Standards Update 2016-09 [Member]
Operating Loss Carryforwards [Line Items]
Deferred income tax assets		43,600								43,600
Cumulative effect of new accounting principle in period of adoption		43,585								43,585
Accounting Standards Update 2016-09 [Member] \| Retained Earnings [Member]
Operating Loss Carryforwards [Line Items]
Cumulative effect of new accounting principle in period of adoption		$ 43,585								43,585
Subsequent Event [Member]
Operating Loss Carryforwards [Line Items]
Federal statutory income tax rate, percent	21.00%
Non-US [Member]
Operating Loss Carryforwards [Line Items]
Revenues										$ 484,900