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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Reconciliation of Effective Tax Rate to Federal Statutory Tax Rate

The following is a reconciliation of our effective tax rate to the federal statutory tax rate:

	Years Ended December 31,
	2018				2017				2016
U.S. federal statutory rate		21.0		%		34.9		%		35.0		%
Federal tax law changes		0.5				(112.2	)			-
State taxes, net of federal benefit		3.7				2.8				2.7
Federal and state incentives		(0.9	)			(7.0	)			(0.4	)
State law changes		-				2.0				0.4
Permanent differences		0.6				0.2				1.0
Net effective rate		24.9		%		(79.3	)	%		38.7		%

Summary of Provision for Income Taxes

The following is a summary of our provision for income taxes (in thousands):

	Years Ended December 31,
	2018				2017				2016
Current
Federal	$	(13,750	)		$	(10,426	)		$	21,527
State and local		1,740				1,542				3,053
Foreign		(234	)			59				108
		(12,244	)			(8,825	)			24,688
Deferred
Federal		36,968				(46,922	)			10,867
State and local		4,134				2,667				890
Foreign		206				(3	)			(64	)
		41,308				(44,258	)			11,693
Total provision	$	29,064			$	(53,083	)		$	36,381

Summary of Deferred Tax Assets and Liabilities

The following is a summary of our deferred tax assets and liabilities (in thousands)

	December 31,
	2018				2017
Accrued compensation		10,538				9,441
Other reserves		8,568				6,736
Tax credit carryforwards		5,062				3,411
Operating loss carryforwards		6,914				1,388
Total gross deferred income taxes		31,082				20,976
Valuation allowances		(3,128	)			(1,681	)
Total deferred tax assets		27,954				19,295
Prepaids		(5,409	)			(3,587	)
Other receivables		(1,588	)			(2,462	)
Property and equipment		(119,716	)			(79,224	)
Goodwill		(55,118	)			(55,117	)
Total deferred tax liabilities		(181,831	)			(140,390	)
Total deferred taxes	$	(153,877	)		$	(121,095	)

Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):

	2018				2017
Gross unrecognized tax benefits - beginning of the year	$	3,827			$	1,832
Gross (decreases) increases related to prior year tax positions		(397	)			1,830
Gross increases related to current year tax positions		959				290
Lapse of applicable statute of limitations		(495	)			(125	)
Gross unrecognized tax benefits - end of year	$	3,894			$	3,827

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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