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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  |  | $ (10,000)
Assets Beginning Balance |  |  |  | 158,000
Purchases and Issuances |  |  |  | 0
Sales and Settlements |  |  |  | 0
Transfers In (Out) |  |  |  | 0
Assets Ending Balance |  | $ 168,000 |  | 168,000
Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | $ 4,000 | (4,000) |  |
Assets Beginning Balance | 168,000 | 164,000 |  |
Assets Ending Balance | 164,000 | 168,000 | $ 164,000 | 168,000
Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | 5,000 |
Assets Beginning Balance |  |  | 169,000 |
Purchases and Issuances |  |  | 0 |
Sales and Settlements |  |  | 0 |
Transfers In (Out) |  |  | 0 |
Assets Ending Balance | 164,000 |  | 164,000 |
Municipal obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 | (14,000) | 8,000
Assets Beginning Balance |  | 36,000 | 35,000 | 44,000
Purchases and Issuances |  |  | (76,000) | 0
Sales and Settlements |  |  | (125,000) | 0
Transfers In (Out) |  |  | 0 | 0
Assets Ending Balance | 0 | 36,000 | 0 | 36,000
ARS purchase commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 878,000 |  | 849,000
Assets Beginning Balance |  | 878,000 |  | 849,000
Purchases and Issuances |  |  |  | 0
Sales and Settlements |  |  |  | 0
Transfers In (Out) |  |  |  | 0
Assets Ending Balance |  | 0 |  | 0
Auction rate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 902,000 | (502,000) | 55,000 | 1,144,000
Assets Beginning Balance | 87,350,000 | 89,743,000 | 87,398,000 | (84,926,000)
Purchases and Issuances | (4,050,000) | (17,050,000) | (4,100,000) | 22,050,000
Sales and Settlements | (275,000) | (125,000) | (1,220,000) | (950,000)
Transfers In (Out) | 17,602,000 |  | 17,602,000 | 0
Assets Ending Balance | 72,621,000 | 107,170,000 | 72,621,000 | 107,170,000
ARS purchase commitments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Purchases and Issuances |  |  | 0 |
Sales and Settlements |  |  | 0 |
Transfers In (Out) |  |  | (91,000) |
Liabilities Beginning Balance | 183,000 | 359,000 | 8,000 | 645,000
Total Realized and Unrealized Gains (Loss), Liabilities | (39,000) | 105,000 | (214,000) | 391,000
Liabilities Ending Balance | 131,000 | 254,000 | $ 131,000 | 254,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net | 91,000 |  |  |
Auction rate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers, Net | $ 17,600,000 | $ 0 |  | $ 0

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- Definition Amount of gain (loss) recognized in the income statement for 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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