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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Components of Income Tax Provision

     Components of the income tax provision applicable to federal, state and foreign income taxes for the years ended December 31, 2018, 2017 and 2016 are as follows (in thousands):

		2018				2017				2016
Federal income tax benefit:
Current		$	(3,954	)		$	(42	)		$	(24,777	)
Deferred			(35,081	)			(335,106	)			(134,592	)
			(39,035	)			(335,148	)			(159,369	)
State income tax expense (benefit):
Current			1,704				(215	)			(257	)
Deferred			(11,147	)			4,511				(14,163	)
			(9,443	)			4,296				(14,420	)
Foreign income tax expense (benefit):
Current			(2,552	)			(3,108	)			(368	)
Deferred			5,043				249				(3,405	)
			2,491				(2,859	)			(3,773	)
Total income tax benefit:
Current			(4,802	)			(3,365	)			(25,402	)
Deferred			(41,185	)			(330,346	)			(152,160	)
Total income tax benefit:		$	(45,987	)		$	(333,711	)		$	(177,562	)

Difference Between Statutory Federal Income Tax Rate and Effective Income Tax Rate

     The difference between the statutory federal income tax rate and the effective income tax rate for the years ended December 31, 2018, 2017 and 2016 is summarized as follows:

		2018				2017				2016
Statutory tax rate			21.0	%			35.0	%			35.0	%
State income taxes - net of the federal income tax benefit			1.2				1.9				2.0
Goodwill impairment			(6.9	)			—				—
Permanent differences			(0.6	)			(1.3	)			(0.1	)
Tax effects of tax reform			(1.3	)			66.7				—
Share-based payments			(0.1	)			3.6				—
Acquisition related differences			—				(3.3	)			—
Valuation allowance			(3.7	)			—				—
State deferred tax remeasurement			2.3				—				—
Other differences, net			0.6				(0.8	)			(1.1	)
Effective tax rate			12.5	%			101.8	%			35.8	%

Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities

     The tax effect of significant temporary differences representing deferred tax assets and liabilities at December 31, 2018 and 2017 are as follows (in thousands):

		2018				2017
Deferred tax assets:
Net operating loss carryforwards		$	324,389			$	275,402
Tax credits			6,404				9,053
Expense associated with stock options and restricted stock			13,375				12,126
Workers' compensation allowance			19,900				19,323
Other			22,423				25,891
			386,491				341,795
Allowance to reduce deferred tax asset to expected realizable value			(13,232	)			—
Total deferred tax assets			373,259				341,795
Deferred tax liabilities:
Property and equipment basis difference			(669,196	)			(678,093	)
Other			(10,224	)			(10,663	)
Total deferred tax liabilities			(679,420	)			(688,756	)
Net deferred tax liability		$	(306,161	)		$	(346,961	)

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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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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-Name Accounting Standards Codification
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-SubTopic 10
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