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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Level Three Principal Amount | $ 48,079
Valuation Adjustment For Level Three Asset and Liability | 3,811
Fair Value Of Level Three Assets and Liabilities | 44,268
Auction rate securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Level Three Principal Amount | 40,650
Valuation Adjustment | 2,697
Fair Value | 37,953
Auction Rate Preferred Securities 01 [Member] | Auction rate securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Level Three Principal Amount | 18,950
Valuation Adjustment | 2,697
Fair Value | $ 16,253
Fair Value Measurement, Valuation Techniques | Tender Offer (7)
Municipal Auction Rate Securities [Member] |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 175.00%
U S Treasury Rate | 2.49%
Municipal Auction Rate Securities [Member] | Auction rate securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Level Three Principal Amount | $ 75
Valuation Adjustment | 0
Fair Value | $ 75
Fair Value Measurement, Valuation Techniques | Discounted Cash Flow
Fair Value Input, Discount Rate | 3.96%
Fair Value Unobservable Inputs Duration | 2 years
Fair Value Unobservable Input Current Yield | 5.50%
Municipal Auction Rate Securities [Member] | Weighted Average [Member] | Auction rate securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 3.96%
Fair Value Unobservable Inputs Duration | 2 years
Fair Value Unobservable Input Current Yield | 5.50%
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%
Student Loan Auction Rate Securities | Auction rate securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Level Three Principal Amount | $ 275
Valuation Adjustment | 0
Fair Value | $ 275
Fair Value Measurement, Valuation Techniques | Discounted Cash Flow
Fair Value Input, Discount Rate | 3.42%
Fair Value Unobservable Inputs Duration | 4 years
Fair Value Unobservable Input Current Yield | 3.95%
Student Loan Auction Rate Securities | Weighted Average [Member] | Auction rate securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 3.42%
Fair Value Unobservable Inputs Duration | 4 years
Fair Value Unobservable Input Current Yield | 3.95%
Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
U S Treasury Rate | 2.60%
Auction Rate Preferred Securities | Auction rate securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Level Three Principal Amount | $ 21,350
Valuation Adjustment | 0
Fair Value | $ 21,350
Fair Value Measurement, Valuation Techniques | Discounted Cash Flow
Fair Value Unobservable Inputs Duration | 1 year
Auction Rate Preferred Securities | Minimum [Member] |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 110.00%
Auction Rate Preferred Securities | Minimum [Member] | Auction rate securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 2.63%
Fair Value Unobservable Input Current Yield | 2.72%
Auction Rate Preferred Securities | Maximum [Member] |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 150.00%
Auction Rate Preferred Securities | Maximum [Member] | Auction rate securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 3.58%
Fair Value Unobservable Input Current Yield | 4.09%
Auction Rate Preferred Securities | Weighted Average [Member] | Auction rate securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Fair Value Input, Discount Rate | 3.57%
Fair Value Unobservable Inputs Duration | 1 year
Fair Value Unobservable Input Current Yield | 4.07%
Auction Rate Securities Purchase Commitment |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Level Three Principal Amount | $ 7,429
Valuation Adjustment For Level Three Liabilities | 1,114
Fair Value Of Level Three Liabilities | 6,315
Auction Rate Securities Purchase Commitment | Auction Rate Preferred Securities |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Level Three Principal Amount | 7,429
Valuation Adjustment For Level Three Liabilities | 1,114
Fair Value Of Level Three Liabilities | $ 6,315
Fair Value Measurement, Valuation Techniques | Tender Offer (7)

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