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FINANCIAL INSTRUMENTS - Schedule of Cash, Cash Equivalents, Investments and Restricted Cash and Investments Unrealized Loss Positions (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Fair Value
Unrealized Losses Less than 12 Months	$ 560,175
Unrealized Losses 12 Months or Greater	72,518
Total	632,693
Gross Unrealized Loss
Unrealized Losses Less than 12 Months	(177)
Unrealized Losses 12 Months or Greater	(612)
Total	(789)
U.S. Treasury and agencies
Fair Value
Unrealized Losses Less than 12 Months, available for sale	179,766
Unrealized Losses 12 Months or Greater, available for sale	8,121
Total, available for sale	187,887
Gross Unrealized Loss
Unrealized Losses Less than 12 Months, available for sale	(2)
Unrealized Losses 12 Months or Greater, available for sale	(67)
Total, available for sale	(69)
Mutual funds
Fair Value
Unrealized Losses Less than 12 Months, trading	0
Unrealized Losses 12 Months or Greater, trading	6,563
Total, trading	6,563
Gross Unrealized Loss
Unrealized Losses Less than 12 Months, trading	0
Unrealized Losses 12 Months or Greater, trading	(183)
Total, trading	(183)
Government-sponsored enterprises
Fair Value
Unrealized Losses Less than 12 Months, available for sale	0
Unrealized Losses 12 Months or Greater, available for sale	10,895
Total, available for sale	10,895
Gross Unrealized Loss
Unrealized Losses Less than 12 Months, available for sale	0
Unrealized Losses 12 Months or Greater, available for sale	(97)
Total, available for sale	(97)
Corporate notes and bonds
Fair Value
Unrealized Losses Less than 12 Months, available for sale	365,003
Unrealized Losses 12 Months or Greater, available for sale	46,939
Total, available for sale	411,942
Gross Unrealized Loss
Unrealized Losses Less than 12 Months, available for sale	(161)
Unrealized Losses 12 Months or Greater, available for sale	(265)
Total, available for sale	(426)
Mortgage backed securities — commercial
Fair Value
Unrealized Losses Less than 12 Months, available for sale	15,406
Unrealized Losses 12 Months or Greater, available for sale	0
Total, available for sale	15,406
Gross Unrealized Loss
Unrealized Losses Less than 12 Months, available for sale	(14)
Unrealized Losses 12 Months or Greater, available for sale	0
Total, available for sale	$ (14)

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