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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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 valuation allowance for deferred tax assets.

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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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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax expense at statutory rate									$ 29,117	$ 28,564	$ 45,740
Re-measurement of net deferred tax asset due to enactment of new tax legislation									0	0	1,365
Excess tax benefits related to stock-based awards									(449)	(946)	(860)
Valuation allowance									49	0	4
Other									388	324	120
Income tax expense	$ 8,743	$ 4,629	$ 9,111	$ 6,622	$ 6,193	$ 7,979	$ 7,332	$ 6,438	$ 29,105	$ 27,942	$ 46,369
Statutory tax rate (as a percent)									21.00%	21.00%	35.00%