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FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value Measurements
Equity investment	$ 14,146	$ 14,146
Investments, Contingent Purchase Obligation	900
Realized Investment Gains (Losses)	900
Level 2
Fair Value Measurements
Cost	277,079	317,722
Gross Unrealized Gains	5	0
Gross Unrealized Losses	(285)	(454)
Fair Value	276,799	317,268
Short-term:
Fair Value Measurements
Cost	251,197
Gross Unrealized Gains	0
Gross Unrealized Losses	(269)
Short-term: | Level 2
Fair Value Measurements
Cost		257,456
Gross Unrealized Gains		0
Gross Unrealized Losses		(235)
Fair Value	250,928	257,221
Short-term: | Asset-backed Securities
Fair Value Measurements
Cost	34,873
Gross Unrealized Gains	0
Gross Unrealized Losses	(33)
Short-term: | Asset-backed Securities | Level 2
Fair Value Measurements
Cost		28,338
Gross Unrealized Gains		0
Gross Unrealized Losses		(37)
Fair Value	34,840	28,301
Short-term: | Commercial Paper
Fair Value Measurements
Cost	45,035
Gross Unrealized Gains	0
Gross Unrealized Losses	(30)
Short-term: | Commercial Paper | Level 2
Fair Value Measurements
Cost		48,999
Gross Unrealized Gains		0
Gross Unrealized Losses		(23)
Fair Value	45,005	48,976
Short-term: | Corporate bonds
Fair Value Measurements
Cost	171,289
Gross Unrealized Gains	0
Gross Unrealized Losses	(206)
Short-term: | Corporate bonds | Level 2
Fair Value Measurements
Cost		180,119
Gross Unrealized Gains		0
Gross Unrealized Losses		(175)
Fair Value	171,083	179,944
Long-term:
Fair Value Measurements
Cost	25,882
Gross Unrealized Gains	5
Gross Unrealized Losses	(16)
Long-term: | Level 2
Fair Value Measurements
Cost		60,266
Gross Unrealized Gains		0
Gross Unrealized Losses		(219)
Fair Value	25,871	60,047
Long-term: | Asset-backed Securities
Fair Value Measurements
Cost	9,383	23,836
Gross Unrealized Gains	5	0
Gross Unrealized Losses	0	(79)
Long-term: | Asset-backed Securities | Level 2
Fair Value Measurements
Fair Value	9,388	23,757
Long-term: | Corporate bonds
Fair Value Measurements
Cost	16,499
Gross Unrealized Gains	0
Gross Unrealized Losses	(16)
Long-term: | Corporate bonds | Level 2
Fair Value Measurements
Cost		36,430
Gross Unrealized Gains		0
Gross Unrealized Losses		(140)
Fair Value	$ 16,483	$ 36,290

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