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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 ($)
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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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