Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

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	2019			2018			2017
Current income tax provision (benefit):
United States federal (1)	$	—		$	(7,781	)	$	(7,781	)
Various states	—			5			—
Total current income tax (benefit)	—			(7,776		)	(7,781		)
Deferred income tax provision (benefit):
United States federal - taxation on operations	191,328			282,947			81,054
United States federal - effect of US tax reform	—			—			(713,655		)
Various states	21,361			31,931			7,002
Total deferred income tax provision (benefit)	212,689			314,878			(625,599		)
Provision (benefit) for income taxes	$	212,689		$	307,102		$	(633,380	)
Effective tax rate	21.5		%	23.7		%	(405.8		%)

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

	Year ended December 31,
In thousands, except rates	2019			2018			2017
Income before income taxes	$	987,162		$	1,296,802		$	156,067
U.S. federal statutory tax rate	21.0		%	21.0		%	35.0		%
Expected income tax provision based on US statutory tax rate	207,304			272,328			54,623
Items impacting the effective tax rate:
State income taxes, net of federal benefit	31,967			45,920			4,682
Effect of US tax reform legislation	—			—			(713,655		)
Tax benefit (deficiency) from stock-based compensation	(7,971		)	(259		)	3,932
Non-deductible compensation	8,282			2,932			13,813
Sale of Canadian subsidiary and assets	(16,860		)	—			—
Other, net	(10,033		)	(13,819		)	3,225
Provision (benefit) for income taxes	$	212,689		$	307,102		$	(633,380	)
Effective tax rate	21.5		%	23.7		%	(405.8		%)

Components of Deferred Tax Assets and Liabilities

The components of the Company’s deferred tax assets and deferred tax liabilities as of December 31, 2019 and 2018 are reflected in the table below.

	December 31,
In thousands	2019			2018
Deferred tax assets
United States net operating loss carryforwards	$	550,086		$	549,166
Canadian net operating loss carryforwards	—			19,633
Equity compensation	13,157			13,122
Other	18,466			13,622
Total deferred tax assets	581,709			595,543
Canadian valuation allowance	—			(19,633		)
Total deferred tax assets, net of valuation allowance	581,709			575,910
Deferred tax liabilities
Property and equipment	(2,367,137		)	(2,144,767		)
Other	(1,697		)	(5,579		)
Total deferred tax liabilities	(2,368,834		)	(2,150,346		)
Deferred income tax liabilities, net	$	(1,787,125	)	$	(1,574,436	)