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Taxes on Income, Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Deferred tax assets [Abstract] |  |
Allowance for doubtful accounts | $ 2,105 | $ 1,875
Inventory | 5,017 | 3,795
Insurance accruals | 4,119 | 4,599
Deferred compensation | 1,291 | 1,849
Unrealized loss on defined benefit plans | 9,891 | 11,097
Operating loss carryforwards | 81,867 | 15,540
Pension benefits | 6,559 | 549
Other | 22,421 | 16,301
Deferred tax assets, gross | 133,270 | 55,605
Valuation allowances | (25,568) | (15,308)
Deferred tax assets, net of valuation allowance | 107,702 | 40,297
Deferred tax liabilities [Abstract] |  |
Property | (526,873) | (428,947)
Deferred state taxes | (74,638) | (58,366)
Goodwill and other intangibles | (34,235) | (9,015)
Other | (14,741) | (12,420)
Deferred tax liabilities | (650,487) | (508,748)
Net deferred tax liabilities | (542,785) | (468,451)
Operating Loss Carryforward [Abstract] |  |
Deferred tax assets | 18,922 |
Historical net operating loss inherited amount | 35,133 |
State operating loss deferred tax assets | 19,039 | 9,289
Operating loss carryforwards, net of valuation allowance | $ 17,027 | $ 9,289
Expiration dates, operating loss carryforwards | Dec. 31, 2037 |
Unrecognized tax benefits including interest and penalties | $ 1,909 |
Amount that would impact the effective tax rate, if recognized | 1,182 |
Canada [Member] |  |
Operating Loss Carryforward [Abstract] |  |
Operating loss carryforwards | $ 8,541 |
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 | 2012 |
State and Local Jurisdiction [Member] | Maximum [Member] |  |
Open Tax Year [Abstract] |  |
Years open to audit under the statute of limitations | 2017 |
Internal Revenue Service (IRS) [Member] | Minimum [Member] |  |
Open Tax Year [Abstract] |  |
Years open to audit under the statute of limitations | 2015 |
Internal Revenue Service (IRS) [Member] | Maximum [Member] |  |
Open Tax Year [Abstract] |  |
Years open to audit under the statute of limitations | 2017 |

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