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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Beginning Balance | $ 164 | $ 101 | $ 169
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 0 | (5) | 5
Purchases and Issuances |  |  | 0
Sales and Settlements |  |  | 0
Transfers In (Out) | 60 | 106 | 60
Assets Ending Balance | 104 | 0 | 104
Auction rate securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Beginning Balance | 72,621 | 21,699 | 87,398
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 2,163 | (1) | 2,218
Purchases and Issuances | (2,150) | 0 | (6,250)
Sales and Settlements | (34,925) | (350) | 36,145
Transfers In (Out) | 16,253 | 21,350 | 33,855
Assets Ending Balance | 21,430 | $ 0 | 21,430
Auction Rate Securities Purchase Commitment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Purchases and Issuances | 0 |  | 0
Sales and Settlements | 0 |  | 0
Transfers In (Out) | (1,078) |  | (1,169)
Liabilities Beginning Balance | 131 |  | 8
Total Realized and Unrealized Gains (Loss), Liabilities | (948) |  | (1,162)
Liabilities Ending Balance | 1 |  | 1
Municipal obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets Beginning Balance |  |  | 35
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | (14)
Purchases and Issuances |  |  | (76)
Sales and Settlements |  |  | 125
Transfers In (Out) |  |  | 0
Assets Ending Balance | $ 0 |  | $ 0

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset purchases sales issuances settlements. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset sales settlements. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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