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v3.6.0.2

Taxes on Income, Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Current deferred tax assets [Abstract] |  |
Compensated absences | $ 739 | $ 829
Allowance for doubtful accounts | 2,534 | 3,288
Insurance accruals | 6,218 | 4,234
Other | 4,113 | 3,372
Current deferred tax assets, Total | 13,604 | 11,723
Deferred tax assets [Abstract] |  |
Postretirement health care benefits | 2,234 | 2,501
Insurance accruals | 2,910 | 3,410
Deferred compensation | 11,124 | 10,534
Unrealized loss on defined benefit plans | 28,832 | 25,245
Operating loss carryforwards | 7,846 | 5,188
Other | 21,622 | 20,702
Valuation allowances | (7,417) | (4,716)
Deferred tax assets | 67,151 | 62,864
Deferred tax liabilities [Abstract] |  |
Property | (654,751) | (604,737)
Deferred state taxes | (54,812) | (53,542)
Pension benefits | (2,799) | (8,471)
Goodwill and other intangibles | (51,551) | (44,185)
Other | (22,295) | (21,737)
Deferred tax liabilities | (786,208) | (732,672)
Net deferred tax liabilities | (719,057) | (669,808)
Operating loss carryforwards, net of valuation allowance | $ 429 |
Expiration dates, operating loss carryforwards | Dec. 31, 2030 |
Deferred tax assets | $ 88,172 | 79,303
Deferred tax assets, net of valuation allowance | 80,755 | $ 74,587
Unrecognized tax benefits including interest and penalties | 2,573 |
Amount that would impact the effective tax rate, if recognized | $ 1,737 |
Minimum [Member] | State and Local Jurisdiction [Member] |  |
Income Tax Examination [Line Items] |  |
Years open to audit under the statute of limitations | 2010 |
Minimum [Member] | Internal Revenue Service (IRS) [Member] |  |
Income Tax Examination [Line Items] |  |
Years open to audit under the statute of limitations | 2013 |
Maximum [Member] | State and Local Jurisdiction [Member] |  |
Income Tax Examination [Line Items] |  |
Years open to audit under the statute of limitations | 2015 |
Maximum [Member] | Internal Revenue Service (IRS) [Member] |  |
Income Tax Examination [Line Items] |  |
Years open to audit under the statute of limitations | 2015 |

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