Income Taxes - Effective Rate (Details)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory U.S. federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	1.70%	1.70%	1.60%
Benefits and taxes related to foreign operations	(5.20%)	(6.20%)	(6.20%)
Windfall tax benefit on share-based compensation	(1.70%)	0.00%	0.00%
Unrecognized tax positions	0.20%	(0.20%)	(0.40%)
Other	0.30%	0.10%	0.10%
Effective income tax rates	30.30%	30.40%	30.10%

Effective Income Tax Rate Reconciliation Unrecognized Tax Benefits

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

+ References

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

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