Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of Income Tax Expense

Income tax expense consisted of the following (in thousands):

	Years Ended December 31,
	2020		2019		2018
Current:
Federal	$	53,297	$	29,102	$	7,428
State	12,106		9,547		9,841
Foreign	446		(88)		770
	65,849		38,561		18,039
Deferred:
Federal	(8,988)		15,094		37,284
State	(1,245)		1,307		410
	(10,233)		16,401		37,694
Total income tax expense	$	55,616	$	54,962	$	55,733

Schedule of Effective Income Tax Rate Reconciliation

The effective income tax rate differs from the federal corporate tax rate of 21% in 2020, 2019, and 2018 as follows (in thousands):

	Years Ended December 31,
	2020		2019		2018
Tax at statutory rate	$	47,186	$	46,600	$	47,015
State income taxes, net of federal tax benefits	8,580		8,575		8,098
Non-deductible meals and entertainment	903		1,117		1,044
Income tax credits	(1,200)		(1,600)		(1,800)
Equity compensation	(821)		(207)		(312)
Other, net	968		477		1,688
Total income tax expense	$	55,616	$	54,962	$	55,733

Schedule of Deferred Tax Assets and Liabilities

At December 31, deferred income tax assets and liabilities consisted of the following (in thousands):

	December 31,
	2020		2019
Deferred income tax assets:
Insurance and claims accruals	$	54,913	$	48,537
Compensation-related accruals	16,054		8,067
Allowance for uncollectible accounts	4,070		3,690
Other	5,374		1,863
Gross deferred income tax assets	80,411		62,157
Deferred income tax liabilities:
Property and equipment	308,145		305,575
Prepaid expenses	6,333		4,928
Other	3,803		1,323
Gross deferred income tax liabilities	318,281		311,826
Net deferred income tax liability	$	237,870	$	249,669

Reconciliation of Unrecognized Tax Benefits

The reconciliations of beginning and ending gross balances of unrecognized tax benefits for 2020 and 2019 are shown below (in thousands).

	December 31,
	2020		2019
Unrecognized tax benefits, beginning balance	$	2,541	$	2,577
Gross increases – tax positions in prior period	92		127
Gross increases – current period tax positions	220		222
Settlements	(490)		(385)
Unrecognized tax benefits, ending balance	$	2,363	$	2,541