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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, 2018 | Dec. 31, 2017
Investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Beginning Balance | $ 169 | $ 158
Total Realized and Unrealized Gains (Losses), Assets | (8) | 11
Purchases and Issuances | 0 |
Sales and Settlements | 0 |
Transfers In (Out) | (60) |
Assets Ending Balance | 101 | 169
Auction Rate Securities Purchase Commitment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Beginning Balance | 0 | 849
Total Realized and Unrealized Gains (Losses), Assets |  | (849)
Assets Ending Balance |  | 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 | 1,096 |
Auction rate securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Beginning Balance | 87,398 | 84,926
Total Realized and Unrealized Gains (Losses), Assets | 1,351 | 1,177
Purchases and Issuances | 6,300 | 27,225
Sales and Settlements | (35,675) | (1,475)
Transfers In (Out) | (37,675) | (24,455)
Assets Ending Balance | 21,699 | 87,398
Auction Rate Securities Purchase Commitment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Liabilities Beginning Balance | 8 | 645
Total Realized and Unrealized Gains (Loss), Liabilities | (1,088) | 637
Liabilities Ending Balance | 0 | 8
Municipal obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets Beginning Balance | 35 | 44
Total Realized and Unrealized Gains (Losses), Assets | 14 | (9)
Purchases and Issuances | 76 |
Sales and Settlements | (125) | 0
Transfers In (Out) | 0 |
Assets Ending Balance | $ 0 | $ 35

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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 (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + 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 (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + 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)(3) -URI http://asc.fasb.org/extlink&oid=99377789&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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