SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	$ 31,488	$ 29,005	$ 27,582
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense	13,258	2,824	7,420
Valuation Allowances and Reserves, Additions for Charges to Other Accounts	0	0	0
Valuation Allowances and Reserves, Deductions	(7,381)	(2,271)	(6,536)
Valuation Allowances and Reserves, Additions for Adjustments	(2,213)	1,930	539
Valuation Allowances and Reserves, Balance	35,152	31,488	29,005
Inventory Valuation Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	34,960	34,625	28,352
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense	20,446	5,510	22,764
Valuation Allowances and Reserves, Additions for Charges to Other Accounts	0	0	0
Valuation Allowances and Reserves, Deductions	(12,113)	(6,440)	(16,492)
Valuation Allowances and Reserves, Additions for Adjustments	(2,163)	1,265	1
Valuation Allowances and Reserves, Balance	41,130	34,960	34,625
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	155,131	153,740	161,030
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense	9,743	17,269	21,013
Valuation Allowances and Reserves, Additions for Charges to Other Accounts	7,180	(1,562)	(1,751)
Valuation Allowances and Reserves, Deductions	(16,706)	(17,432)	(14,813)
Valuation Allowances and Reserves, Additions for Adjustments	(7,325)	3,116	(11,739)
Valuation Allowances and Reserves, Balance	$ 148,023	$ 155,131	$ 153,740