INCOME TAX PROVISION (deferred income taxes) (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets
Employee benefit plans							$ 1,420
Intangible assets	[1]					$ 14,900
Operating leases						11,409
Net operating loss, tax credit and capital loss carryforwards						7,698	9,380
Reserves and accruals						6,154	8,893
Inventories						2,595	2,043
All other						2,756	3,237
Total deferred taxes						45,512	24,973
Valuation allowances			$ (1,689)	$ (1,518)	$ (2,545)	(10,349)	(1,689)	$ (1,518)
Net deferred taxes						35,163	23,284
Deferred tax liabilities
Goodwill	[1]					16,424	47,993
Revenue recognition						4,752	3,185
Prepaid assets						3,830	3,469
Property, plant and equipment						3,200	1,739
Employee benefit plans						2,747
Installment sales treatment of notes receivable						1,171	3,054
Intangible assets	[1]						3,780
Operating leases						10,578
All other						3,452	3,858
Total deferred taxes						46,154	67,078
Net deferred taxes						46,154	67,078
Changes in deferred tax asset valuation allowances
Balance, beginning of year			(1,689)	(1,518)	(2,545)
(Expense) benefit from change in allowances		$ (8,432)	(8,336)	(290)	1,015
Foreign currency translation			(324)	119	12
Balance, end of year			$ (10,349)	$ (1,689)	$ (1,518)
Cash and cash equivalents						73,620	$ 59,740	$ 59,240
Foreign, primarily Canada [Member]
Changes in deferred tax asset valuation allowances
Cash and cash equivalents						$ 69,046

[1] The change in these deferred income taxes in 2019, as compared to 2018, was primarily the result of asset impairment charges recorded during 2019. Further information can be found in Note 8.