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Accounting Policies (Narratives) (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Cash, Insured and Uninsured [Abstract] |  |  |  |  |  |
Cash, FDIC Insured Amount | $ 250,000 |  | $ 250,000 |  |  |
Cash, CDIC insured amount | $ 100,000 |  | $ 100,000 |  |  |
LIFO Method Related Items [Abstract] |  |  |  |  |  |
Percentage of LIFO inventory | 96.00% |  | 96.00% |  |  |
Inventory, LIFO reserve | $ 18,987,000 |  | $ 16,126,000 |  |  |
Effect of LIFO inventory liquidation on income | 100,000 |  |  |  |  |
Disposition of Property, Plant and Equipment |  |  |  |  |  |
Net amount of (gains) losses netted against depreciation expense | 27,000,000 |  | 11,800,000 |  | $ 32,500,000 |
Additional operating expenses | $ 21,000,000 |  | 23,100,000 |  |  |
Schedule of rental trucks depreciation: |  |  |  |  |  |
Percentage reduction for year one, depreciation | 16.00% |  |  |  |  |
Percentage reduction for year two, depreciation | 13.00% |  |  |  |  |
Percentage reduction for year three, depreciation | 11.00% |  |  |  |  |
Percentage reduction for year four, depreciation | 9.00% |  |  |  |  |
Percentage reduction for year five, depreciation | 8.00% |  |  |  |  |
Percentage reduction for year six, depreciation | 7.00% |  |  |  |  |
Percentage reduction for year seven, depreciation | 6.00% |  |  |  |  |
Salvage value percentage | 15.00% |  |  |  |  |
Percentage reduction if straight line approach used each year for depreciation calculation | 5.70% |  |  |  |  |
Real Estate Companies Disclosures [Abstract] |  |  |  |  |  |
Carrying value of surplus real estate | $ 53,500,000 |  | 53,800,000 |  |  |
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract] |  |  |  |  |  |
Self insurance reserve | 407,900,000 |  | 408,500,000 |  |  |
Accrued insurance, noncurrent | 15,600,000 |  | 15,200,000 |  |  |
Marketing and Advertising Expense [Abstract] |  |  |  |  |  |
Advertising expense | 10,600,000 |  | 8,100,000 |  | 8,700,000 |
Policyholder Benefits and Claims Incurred [Abstract] |  |  |  |  |  |
Deferred sales inducements, net |  | $ 19,100,000 |  | $ 21,200,000 |  |
Deferred sales inducements, amortization expense |  | $ 3,700,000 |  | $ 3,700,000 |  | $ 3,300,000
Adoption of New Accounting Pronounements |  |  |  |  |  |
Other components of net periodic benefit cost | 1,013,000 |  | $ 927,000 |  | $ 902,000 |
Operating lease commitment, asset | 111,200,000 |  |  |  |  |
Operating lease commitment, liability | $ 109,600,000 |  |  |  |  |
Engine and Transmission Overhaul [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |  |  |  |
Property, plant and equipment, useful life | 2 years |  |  |  |  |
Engine and Transmission Overhaul [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |  |  |  |
Property, plant and equipment, useful life | 20 years |  |  |  |  |
All Nonrental Equipment [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |  |  |  |
Property, plant and equipment, useful life | 3 years |  |  |  |  |
All Nonrental Equipment [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |  |  |  |
Property, plant and equipment, useful life | 55 years |  |  |  |  |

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