Taxes on Income (Tables)

12 Months Ended

Dec. 31, 2017

Taxes on Income [Abstract]

Earnings Before Taxes

Earnings before taxes on income and details of the provision for taxes on income for the years ended December 31, 2017, 2016 and 2015 were as follows (in thousands):

	2017			2016		2015
Earnings (loss) before taxes on income:
United States	$	74,267		$	227,746	$	361,712
Foreign		(1,253	)		—		—
	$	73,014		$	227,746	$	361,712
Provision (benefit) for taxes on income:
U.S. Federal:
Current	$	11,143		$	28,919	$	64,707
Deferred		(258,703	)		49,685		59,582
	$	(247,560	)	$	78,604	$	124,289
U.S. State:
Current	$	3,861		$	4,727	$	6,280
Deferred		2,280			1,611		3,173
	$	6,141		$	6,338	$	9,453
Foreign:
Current	$	370		$	—	$	—
Deferred		160			—		—
	$	530		$	—	$	—
Consolidated:
Current	$	15,374		$	33,646	$	70,987
Deferred		(256,263	)		51,296		62,755
	$	(240,889	)	$	84,942	$	133,742

Schedule of Effective Income Tax Rate Reconciliation

The Company’s provision for taxes on income varied from the statutory federal income tax rate for the years ended December 31, 2017, 2016 and 2015 due to the following:

	2017			2016			2015
United States income tax statutory rate		35.0	%		35.0	%		35.0	%
State and local taxes, net of federal benefit		0.9			1.8			1.7
Change due to U.S. tax reform		(369.0	)		—			—
Other – net		3.2			0.5			0.3
		(329.9	)%		37.3	%		37.0	%

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences that give rise to significant portions of the non-current deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows (in thousands):

	2017			2016
Non-current deferred tax assets and liabilities:
Deferred tax assets:
Compensated absences	$	432		$	739
Allowance for doubtful accounts		1,875			2,534
Postretirement health care benefits		1,190			2,234
Insurance accruals		4,599			9,128
Deferred compensation		1,849			11,124
Unrealized loss on defined benefit plans		11,097			28,832
Operating loss carryforwards		15,540			7,846
Pension benefits		549			—
Other		18,474			25,735
		55,605			88,172
Valuation allowances		(15,308	)		(7,417	)
		40,297			80,755
Deferred tax liabilities:
Property		(428,947	)		(654,751	)
Deferred state taxes		(58,366	)		(54,812	)
Pension benefits		—			(2,799	)
Goodwill and other intangibles		(9,015	)		(51,551	)
Other		(12,420	)		(22,295	)
		(508,748	)		(786,208	)
	$	(468,451	)	$	(705,453	)

Reconciliation of Liability for Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of the liability for unrecognized tax benefits for the years ended December 31, 2017, 2016 and 2015, is as follows (in thousands):

	2017			2016			2015
Balance at beginning of year	$	2,019		$	1,958		$	1,171
Additions based on tax positions related to the current year		403			187			339
Additions for tax positions of prior years		273			867			785
Reductions for tax positions of prior years		(908	)		(441	)		(337	)
Settlements		—			(552	)		—
Balance at end of year	$	1,787		$	2,019		$	1,958