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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Effective tax rate	21.40%	28.00%		24.20%	27.00%
Discrete tax benefit	$ 660	$ 5,714		$ 5,178	$ 14,761
Discrete tax benefit, equity based compensation	1,026	3,738		10,920	10,883
Discrete tax benefit, provision adjustment	(4,247)	$ 2,111		4,001	2,111
Discrete tax rate adjustment, inventory	2,195			6,584
Discrete tax rate adjustment, valuation allowance	$ 3,046			3,046
Discrete tax benefit, reversal of tax reserve					$ 2,240
Decrease in income taxes				7,939
Tax Cuts and Jobs Act of 2017, income tax expense			$ 4,747
Tax benefit				$ 3,621

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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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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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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

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