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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, 2018
Subsequent Event [Line Items]
Tax benefit	$ 7,502	$ 10,527	$ 6,035	$ 20,789
Tax impact of share-based awards			1,100
Unrecognized tax benefits	$ 0		$ 0
Minimum | Forecast
Subsequent Event [Line Items]
Effective tax rate					21.00%
Maximum | Forecast
Subsequent Event [Line Items]
Effective tax rate					23.00%

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- Definition

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

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