Schedule II - Valuation and Qualifying Accounts and Reserves (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Valuation Allowances and Reserves [Table Text Block]

	Balance at		Charged to
	Beginning of		Costs and					Balance at
Description	Year		Expenses		Deductions			End of Year
Insurance and claims accruals:
Year ended December 31, 2020	$	31,729	$	64,276	$	(56,410	)(1)	$	39,595
Year ended December 31, 2019		28,103		56,075		(52,449	)(1)		31,729
Year ended December 31, 2018		26,177		56,122		(54,196	)(1)		28,103
Allowance for doubtful accounts:
Year ended December 31, 2020		382		220		(254	)(2)		348
Year ended December 31, 2019		348		65		(31	)(2)		382
Year ended December 31, 2018		300		163		(115	)(2)		348