Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 11,692	$ 9,913	$ 10,884
Charged to Costs and Expenses	4,320	3,471	1,439
Charged to Other	322	(425)	243
Deductions	1,952	1,267	2,653
Balance at End of Year	14,382	11,692	9,913
LIFO Reserve
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	18,854	17,632	17,319
Charged to Costs and Expenses	1,349	1,222	313
Charged to Other	0	0	0
Deductions	0	0	0
Balance at End of Year	20,203	18,854	17,632
Valuation Allowance on Deferred Tax Assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	103,289	47,199	49,797
Charged to Costs and Expenses	2,662	(11,187)	6,967
Charged to Other	(1,116)	70,993	(2,365)
Deductions	(512)	3,716	7,200
Balance at End of Year	$ 105,347	$ 103,289	$ 47,199