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FAIR VALUE - Unrealized loss positions (Details) $ in Thousands | Mar. 31, 2018 USD ($)
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Fair value of investments in unrealized loss positions |
Total fair value of available-for-sale securities in a continuous unrealized loss position for less than twelve months | $ 843,087
Total fair value of available for sale securities in a continuous unrealized loss position for greater than twelve months | 26,395
Total fair value of available-for-sale securities in a continuous unrealized loss position | 869,482
Gross unrealized loss of investments in unrealized loss positions |
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months | (2,251)
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for greater than twelve months | (48)
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position | (2,299)
Contractual maturities of the available-for-sale investments in debt securities, Cost |
Due in one year or less | 529,218
Due after one year through four years | 366,551
Contractual maturities of the available-for-sale investments in debt securities, Fair Value |
Due in one year or less | 528,072
Due after one year through four years | 365,402
Corporate bonds |
Fair value of investments in unrealized loss positions |
Total fair value of available-for-sale securities in a continuous unrealized loss position for less than twelve months | 328,935
Total fair value of available-for-sale securities in a continuous unrealized loss position | 328,935
Gross unrealized loss of investments in unrealized loss positions |
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months | (1,073)
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position | (1,073)
Contractual maturities of the available-for-sale investments in debt securities, Cost |
Due in one year or less | 224,976
Due after one year through four years | 121,217
Contractual maturities of the available-for-sale investments in debt securities, Fair Value |
Due in one year or less | 224,287
Due after one year through four years | 120,836
Asset backed securities |
Fair value of investments in unrealized loss positions |
Total fair value of available-for-sale securities in a continuous unrealized loss position for less than twelve months | 252,105
Total fair value of available for sale securities in a continuous unrealized loss position for greater than twelve months | 1,442
Total fair value of available-for-sale securities in a continuous unrealized loss position | 253,547
Gross unrealized loss of investments in unrealized loss positions |
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months | (841)
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for greater than twelve months | (2)
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position | (843)
Contractual maturities of the available-for-sale investments in debt securities, Cost |
Due in one year or less | 30,844
Due after one year through four years | 223,546
Contractual maturities of the available-for-sale investments in debt securities, Fair Value |
Due in one year or less | 30,753
Due after one year through four years | 222,794
U.S. government agency securities |
Fair value of investments in unrealized loss positions |
Total fair value of available-for-sale securities in a continuous unrealized loss position for less than twelve months | 169,071
Total fair value of available for sale securities in a continuous unrealized loss position for greater than twelve months | 24,953
Total fair value of available-for-sale securities in a continuous unrealized loss position | 194,024
Gross unrealized loss of investments in unrealized loss positions |
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months | (237)
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for greater than twelve months | (46)
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position | (283)
Contractual maturities of the available-for-sale investments in debt securities, Cost |
Due in one year or less | 174,495
Due after one year through four years | 19,812
Contractual maturities of the available-for-sale investments in debt securities, Fair Value |
Due in one year or less | 174,218
Due after one year through four years | 19,806
Commercial paper. |
Fair value of investments in unrealized loss positions |
Total fair value of available-for-sale securities in a continuous unrealized loss position for less than twelve months | 51,425
Total fair value of available-for-sale securities in a continuous unrealized loss position | 51,425
Gross unrealized loss of investments in unrealized loss positions |
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months | (21)
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position | (21)
Contractual maturities of the available-for-sale investments in debt securities, Cost |
Due in one year or less | 52,015
Contractual maturities of the available-for-sale investments in debt securities, Fair Value |
Due in one year or less | 51,994
Certificates of deposit |
Fair value of investments in unrealized loss positions |
Total fair value of available-for-sale securities in a continuous unrealized loss position for less than twelve months | 41,551
Total fair value of available-for-sale securities in a continuous unrealized loss position | 41,551
Gross unrealized loss of investments in unrealized loss positions |
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months | (79)
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position | (79)
Contractual maturities of the available-for-sale investments in debt securities, Cost |
Due in one year or less | 46,888
Due after one year through four years | 1,976
Contractual maturities of the available-for-sale investments in debt securities, Fair Value |
Due in one year or less | 46,820
Due after one year through four years | $ 1,966

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