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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Level Two and Three Principal Amount | $ 47,955,000
Valuation Adjustment For Level Two and Three Assets | 3,794,000
Fair Value Of Level Two and Three Assets | $ 44,161,000
Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
U S Treasury Rate | 2.60%
Municipal Auction Rate Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 175.00%
U S Treasury Rate | 2.49%
Student Loan Auction Rate Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 1.20%
U S Treasury Rate | 2.48%
Auction Rate Securities Owned |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Level Two and Three Principal Amount | $ 40,650,000
Valuation Adjustment For Level Two and Three Assets | 2,698,000
Fair Value Of Level Two and Three Assets | 37,952,000
Auction Rate Securities Owned | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Principal | 21,350,000
Valuation Adjustment | 1,000
Fair Value | $ 21,349,000
Fair Value Measurement, Valuation Techniques | Discounted Cash Flow
Weighted Average Discount Rate, Percent | 3.88%
Duration | 1 year
Auction Rate Securities Owned | Auction Rate Preferred Securities 02 [Member] |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Measurement, Valuation Techniques | Tender Offer (4)
Level Two Principal Amount | $ 18,950,000
Valuation Adjustment For Level Two Assets | 2,697,000
Fair Value Of Level Two Assets | 16,253,000
Auction Rate Securities Owned | Municipal Auction Rate Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Principal | 75,000
Valuation Adjustment | 0
Fair Value | $ 75,000
Fair Value Measurement, Valuation Techniques | Discounted Cash Flow
Fair Value Input, Discount Rate | 4.35%
Weighted Average Discount Rate, Percent | 4.35%
Duration | 2 years
Fair Value Unobservable Input Current Yield | 5.51%
Auction Rate Securities Owned | Student Loan Auction Rate Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Principal | $ 275,000
Valuation Adjustment | 0
Fair Value | $ 275,000
Fair Value Measurement, Valuation Techniques | Discounted Cash Flow
Fair Value Input, Discount Rate | 3.68%
Weighted Average Discount Rate, Percent | 3.68%
Duration | 4 years
Fair Value Unobservable Input Current Yield | 3.64%
Minimum [Member] | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 110.00%
Minimum [Member] | Auction Rate Securities Owned | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 2.86%
Fair Value Unobservable Input Current Yield | 2.69%
Maximum [Member] | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 150.00%
Maximum [Member] | Auction Rate Securities Owned | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 3.89%
Maximum [Member] | ARS purchase commitments | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Unobservable Input Current Yield | 4.05%
Weighted Average | Auction Rate Securities Owned | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Duration | 1 year
Fair Value Unobservable Input Current Yield | 4.03%
Weighted Average | Auction Rate Securities Owned | Municipal Auction Rate Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Unobservable Input Current Yield | 5.51%
Weighted Average | Auction Rate Securities Owned | Student Loan Auction Rate Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Duration | 4 years
Fair Value Unobservable Input Current Yield | 3.64%
Weighted Average | Municipal Auction Rate Securities | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Duration | 2 years
ARS purchase commitments |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Measurement, Valuation Techniques | Tender Offer (4)
Level Two Principal Amount | $ 7,305,000
Valuation Adjustment For Level Two Assets | 1,096,000
Fair Value Of Level Two Assets | $ 6,209,000
Other Assets | Minimum [Member] | ARS purchase commitments | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 2.86%
Fair Value Unobservable Input Current Yield | 2.69%
Other Assets | Maximum [Member] | ARS purchase commitments | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 3.89%
Fair Value Unobservable Input Current Yield | 4.05%

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