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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 | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Beginning Balance | $ 101 | $ 169
Total Realized and Unrealized Gains (Losses), Assets | 5 | (8)
Purchases and Issuances | 0 |
Sales and Settlements | 0 |
Transfers In (Out) | (106) |
Assets Ending Balance | 0 | 101
Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Transfers In (Out) |  | (60)
Municipal obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Purchases and Issuances |  | 76
Auction rate securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Beginning Balance | 21,699 | 87,398
Total Realized and Unrealized Gains (Losses), Assets | 1 | 1,351
Purchases and Issuances | 0 | 6,300
Sales and Settlements | (350) | (35,675)
Transfers In (Out) | (21,350) | (37,675)
Assets Ending Balance | 0 | 21,699
Auction Rate Securities Purchase Commitment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Transfers In (Out) |  | 1,096
Liabilities Beginning Balance | 0 | 8
Total Realized and Unrealized Gains (Loss), Liabilities |  | (1,088)
Liabilities Ending Balance |  | 0
Municipal obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Beginning Balance | $ 0 | 35
Total Realized and Unrealized Gains (Losses), Assets |  | 14
Sales and Settlements |  | (125)
Assets Ending Balance |  | $ 0

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- Definition Fair value assets measured on recurring basis change in realized and unrealized gain (loss) included in other income. + References No definition available. + Details
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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 unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + 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 (d) -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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