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Taxes on Income, Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Current deferred tax assets [Abstract] |  |
Compensated absences | $ 829,000 | $ 854,000
Allowance for doubtful accounts | 3,288,000 | 3,111,000
Insurance accruals | 4,234,000 | 2,858,000
Other | 3,372,000 | 3,739,000
Current deferred tax assets, Total | 11,723,000 | 10,562,000
Deferred tax assets [Abstract] |  |
Postretirement health care benefits | 2,501,000 | 2,795,000
Insurance accruals | 3,410,000 | 3,325,000
Deferred compensation | 10,534,000 | 10,157,000
Unrealized loss on defined benefit plans | 25,245,000 | 34,501,000
Operating loss carryforwards | 5,188,000 | 5,219,000
Other | 20,702,000 | 20,687,000
Valuation allowances | (4,716,000) | (4,704,000)
Deferred tax assets | 62,864,000 | 71,980,000
Deferred tax liabilities [Abstract] |  |
Property | (604,737,000) | (547,388,000)
Deferred state taxes | (53,542,000) | (49,503,000)
Pension benefits | (8,471,000) | (11,198,000)
Goodwill and other intangibles | (44,185,000) | (37,936,000)
Other | (21,737,000) | (21,724,000)
Deferred tax liabilities | (732,672,000) | (667,749,000)
Deferred tax assets (liabilities) | (669,808,000) | $ (595,769,000)
Operating loss carryforwards, net of valuation allowance | $ 472,000 |
Expiration dates, operating loss carryforwards | Dec. 31, 2030 |
Unrecognized tax benefits including interest and penalties | $ 2,479,000 |
Amount that would impact the effective tax rate, if recognized | $ 1,678,000 |
Minimum [Member] | State and Local Jurisdiction [Member] |  |
Income Tax Examination [Line Items] |  |
Years open to audit under the statute of limitations | 2009 |
Minimum [Member] | Internal Revenue Service (IRS) [Member] |  |
Income Tax Examination [Line Items] |  |
Years open to audit under the statute of limitations | 2012 |
Maximum [Member] | State and Local Jurisdiction [Member] |  |
Income Tax Examination [Line Items] |  |
Years open to audit under the statute of limitations | 2014 |
Maximum [Member] | Internal Revenue Service (IRS) [Member] |  |
Income Tax Examination [Line Items] |  |
Years open to audit under the statute of limitations | 2014 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensated absences (includes, but not limited to, sick and personal days). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 + Details
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