Income Taxes (Schedule of Income Taxes Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax at federal statutory rate	$ 40,197	$ 40,394	$ 74,495
State income tax, net of federal income tax impact	4,578	6,261	6,011
Domestic production deduction	0	0	(5,511)
Share-based payment compensation excess tax benefit	(1,579)	(2,914)	(7,683)
Changes in tax law (TCJA)	0	612	13,210
Other	1,709	(552)	(562)
Provision for income taxes	$ 44,905	$ 43,801	$ 79,960

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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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