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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