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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