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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax provision	$ 13,835	$ 13,147	$ 23,625	$ 18,213
Effective income tax rate (as a percent)	24.90%	37.20%	23.00%	36.10%
Statutory U.S. income tax rate (as a percent)	21.00%	35.00%	21.00%	35.00%	35.00%
Income taxes paid (refunds), net			$ 6,500	$ 2,500
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Provisional Income Tax Expense (Benefit)					$ (8,100)

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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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