Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Provision for Income Taxes

The items comprising the Company's (provision) benefit for income taxes are as follows for the periods presented:

	Year ended December 31,
In thousands	2018			2017			2016
Current income tax (provision) benefit:
United States federal (1)	$	7,781		$	7,781		$	22,941
Various states	(5		)	—			(2		)
Total current income tax benefit	7,776			7,781			22,939
Deferred income tax (provision) benefit:
United States federal - taxation on operations	(282,947		)	(81,054		)	182,422
United States federal - effect of US tax reform	—			713,655			—
Various states	(31,931		)	(7,002		)	27,414
Total deferred income tax (provision) benefit	(314,878		)	625,599			209,836
(Provision) benefit for income taxes	$	(307,102	)	$	633,380		$	232,775

Schedule of Provision for Income Taxes with Income Tax at Federal Statutory Rate

	Year ended December 31,
	2018					2017					2016
In thousands, except rates	Amount			Rate		Amount			Rate		Amount			Rate
Expected income tax (provision) benefit based on US statutory tax rate	$	(272,328	)	21.0	%	$	(54,623	)	35.0	%	$	221,359		35.0	%
State income taxes, net of federal benefit	(45,920		)	3.6	%	(4,682		)	3.0	%	18,829			3.0	%
Effect of US tax reform legislation	—			—	%	713,655			(457.3	%)	—			—	%
Tax (benefit) deficiency from stock-based compensation	259			—	%	(3,932		)	2.5	%	—			—	%
Non-deductible compensation	(2,932		)	0.2	%	(13,813		)	8.9	%	(3,471		)	(0.5	%)
Other, net	13,819			(1.1	%)	(3,225		)	2.1	%	(3,942		)	(0.7	%)
(Provision) benefit for income taxes	$	(307,102	)	23.7	%	$	633,380		(405.8	%)	$	232,775		36.8	%

Components of Deferred Tax Assets and Liabilities

The components of the Company’s deferred tax assets and deferred tax liabilities as of December 31, 2018 and 2017 are reflected in the table below.

	December 31,
In thousands	2018			2017
Deferred tax assets
United States net operating loss carryforwards	$	549,166		$	604,423
Canadian net operating loss carryforwards	19,633			19,341
Alternative minimum tax carryforwards	—			7,781
Equity compensation	13,122			12,962
Other	13,622			21,885
Total deferred tax assets	595,543			666,392
Canadian valuation allowance	(19,633		)	(19,341		)
Total deferred tax assets, net of valuation allowance	575,910			647,051
Deferred tax liabilities
Property and equipment	(2,144,767		)	(1,903,451		)
Other	(5,579		)	(3,158		)
Total deferred tax liabilities	(2,150,346		)	(1,906,609		)
Deferred income tax liabilities, net	$	(1,574,436	)	$	(1,259,558	)