XML 85 R65.htm IDEA: XBRL DOCUMENT v3.20.4

INVESTMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale
Amortized Cost	$ 925,559	$ 545,771
Gross Unrealized Holding Gains	165	285
Gross Unrealized Holding Losses	79	88
Fair Value	925,645	545,968
Continuous Unrealized Loss Position less than 12 Months	79	88
Short-term | Commercial paper
Available-for-sale
Amortized Cost	119,886	83,478
Fair Value	119,886	83,478
Short-term | Certificates of deposit
Available-for-sale
Amortized Cost	20,387	28,049
Fair Value	20,387	28,049
Short-term | Municipal securities
Available-for-sale
Amortized Cost	9,083	147,983
Gross Unrealized Holding Gains		145
Gross Unrealized Holding Losses		20
Fair Value	9,083	148,108
Continuous Unrealized Loss Position less than 12 Months		20
Short-term | U.S. government agency securities
Available-for-sale
Amortized Cost	81,521	40,620
Gross Unrealized Holding Gains	13	5
Gross Unrealized Holding Losses	3	35
Fair Value	81,531	40,590
Continuous Unrealized Loss Position less than 12 Months	3	35
Short-term | U.S. treasuries
Available-for-sale
Amortized Cost	650,386	211,055
Gross Unrealized Holding Gains	150	134
Gross Unrealized Holding Losses	69	31
Fair Value	650,467	211,158
Continuous Unrealized Loss Position less than 12 Months	69	31
Short-term | Variable rate demand notes
Available-for-sale
Amortized Cost		21,680
Fair Value		21,680
Long-term | Municipal securities
Available-for-sale
Amortized Cost		1,562
Gross Unrealized Holding Losses		1
Fair Value		1,561
Continuous Unrealized Loss Position less than 12 Months		1
Long-term | U.S. government agency securities
Available-for-sale
Amortized Cost	10,350	5,267
Gross Unrealized Holding Gains	1
Gross Unrealized Holding Losses		1
Fair Value	10,351	5,266
Continuous Unrealized Loss Position less than 12 Months		1
Long-term | U.S. treasuries
Available-for-sale
Amortized Cost	33,946	6,077
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	7
Fair Value	33,940	$ 6,078
Continuous Unrealized Loss Position less than 12 Months	$ 7

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_VariableRateDemandObligationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_OtherLongTermInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: