Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	35.00%	35.00%	35.00%
State and local income taxes, net of federal benefit	2.00%	2.00%	2.00%
Effect of foreign operations	(1.00%)	(1.00%)	(2.00%)
Effect of rate changes on deferred taxes	(11.00%)	0.00%	0.00%
Transition tax, net of foreign taxes deemed paid	2.00%	0.00%	0.00%
Nontaxable income attributable to noncontrolling interests	(1.00%)	(1.00%)	(1.00%)
Changes in the valuation allowance	0.00%	5.00%	1.00%
Domestic production activity deduction	(3.00%)	(3.00%)	(3.00%)
Tax expense relating to uncertain tax positions, including accrued interest, net of deferred tax benefits	1.00%	(1.00%)	1.00%
Other	0.00%	0.00%	1.00%
Effective income tax rate	24.00%	36.00%	34.00%

Effective Income Tax Rate Reconciliation, Transition tax, Net of Foreign Taxes Deemed Paid, Percent

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Effective income tax rate reconciliation uncertain tax positions, including accrued interest, net of deferred tax benefits.

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

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

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Percentage 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 changes in the valuation allowance for deferred tax assets.

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Percentage 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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage 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 noncontrolling interest income (loss) exempt from income taxes.

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Percentage 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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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