Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Income Tax Expense

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

	Years Ended December 31,
	2018		2017			2016
Current:
Federal	$	7,428	$	38,535		$	237
State	9,841		3,979			2,928
Foreign	770		102			534
	18,039		42,616			3,699
Deferred:
Federal	37,284		(104,573		)	42,895
State	410		3,625			1,737
	37,694		(100,948		)	44,632
Total income tax expense (benefit)	$	55,733	$	(58,332	)	$	48,331

Schedule of Effective Income Tax Rate Reconciliation

The effective income tax rate differs from the federal corporate tax rate of 21% in 2018 and 35% in 2017 and 2016 as follows (in thousands):

	Years Ended December 31,
	2018			2017			2016
Tax at statutory rate	$	47,015		$	50,595		$	44,611
Change in federal income tax rate	—			(110,508		)	—
State income taxes, net of federal tax benefits	8,098			4,943			3,032
Non-deductible meals and entertainment	1,044			1,495			1,549
Income tax credits	(1,800		)	(1,780		)	(1,900		)
Equity compensation	(312		)	(820		)	—
Other, net	1,688			(2,257		)	1,039
Total income tax expense (benefit)	$	55,733		$	(58,332	)	$	48,331

Schedule of Deferred Tax Assets and Liabilities

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

	December 31,
	2018		2017
Deferred income tax assets:
Insurance and claims accruals	$	47,031	$	41,986
Compensation-related accruals	7,413		6,797
Allowance for uncollectible accounts	3,628		3,599
Other	1,896		1,979
Gross deferred income tax assets	59,968		54,361
Deferred income tax liabilities:
Property and equipment	287,061		243,482
Prepaid expenses	4,772		4,699
Other	1,585		1,367
Gross deferred income tax liabilities	293,418		249,548
Net deferred income tax liability	$	233,450	$	195,187

Reconciliation of Unrecognized Tax Benefits

The reconciliations of beginning and ending gross balances of unrecognized tax benefits for 2018 and 2017 are shown below (in thousands).

	December 31,
	2018			2017
Unrecognized tax benefits, beginning balance	$	2,883		$	6,055
Gross increases – tax positions in prior period	106			168
Gross decreases – tax positions in prior period	—			—
Gross increases – current-period tax positions	444			136
Settlements	(856		)	(3,476		)
Unrecognized tax benefits, ending balance	$	2,577		$	2,883