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Taxes on Income, Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets [Abstract]
Allowance for doubtful accounts	$ 1,758,000	$ 2,105,000
Inventory	13,401,000	5,017,000
Insurance accruals	4,397,000	4,119,000
Deferred compensation	1,109,000	1,291,000
Unrealized loss on defined benefit plans	10,253,000	9,891,000
Operating loss carryforwards	143,181,000	81,867,000
Pension benefits	6,825,000	6,559,000
Other	7,392,000	22,421,000
Deferred tax assets, gross	188,316,000	133,270,000
Valuation allowances	(20,525,000)	(25,568,000)
Deferred tax assets, net of valuation allowance	167,791,000	107,702,000
Deferred tax liabilities [Abstract]
Property	(620,891,000)	(526,873,000)
Deferred state taxes	(63,640,000)	(74,638,000)
Goodwill and other intangibles	(54,844,000)	(34,235,000)
Other	(16,620,000)	(14,741,000)
Deferred tax liabilities	(755,995,000)	(650,487,000)
Net deferred tax liabilities	(588,204,000)	(542,785,000)
Operating Loss Carryforward [Abstract]
Deferred tax assets	117,134,000
State operating loss deferred tax assets	17,282,000	19,039,000
Operating loss carryforwards, net of valuation allowance	$ 11,760,000	$ 17,027,000
Expiration dates, operating loss carryforwards	Dec. 31, 2037
Unrecognized tax benefits including interest and penalties	$ 1,172,000
Amount that would impact the effective tax rate, if recognized	960,000
Canada [Member]
Operating Loss Carryforward [Abstract]
Operating loss carryforwards	$ 8,765,000
Expiration dates, operating loss carryforwards	Dec. 31, 2038
State and Local Jurisdiction [Member] | Minimum [Member]
Open Tax Year [Abstract]
Years open to audit under the statute of limitations	2013
State and Local Jurisdiction [Member] | Maximum [Member]
Open Tax Year [Abstract]
Years open to audit under the statute of limitations	2018
Internal Revenue Service (IRS) [Member] | Minimum [Member]
Open Tax Year [Abstract]
Years open to audit under the statute of limitations	2016
Internal Revenue Service (IRS) [Member] | Maximum [Member]
Open Tax Year [Abstract]
Years open to audit under the statute of limitations	2018

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