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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) | 6 Months Ended
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Jun. 30, 2016 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 117,567,000
Valuation Adjustment | 830,000
Fair Value | $ 116,737,000
Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
U S Treasury Rate | 0.86%
Municipal Auction Rate Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 175.00%
U S Treasury Rate | 0.94%
Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 1.20%
U S Treasury Rate | 1.29%
Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 110.00%
Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 150.00%
Auction Rate Securities Owned [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 90,700,000
Valuation Adjustment | 1,599,000
Fair Value | 89,101,000
Auction Rate Securities Owned [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 86,750,000
Valuation Adjustment | 1,156,000
Fair Value | $ 85,594,000
Valuation Technique | Discounted Cash Flow
Duration | 4 years
Current Yield | 0.77%
Auction Rate Securities Owned [Member] | Municipal Auction Rate Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 25,000
Valuation Adjustment | 0
Fair Value | $ 25,000
Valuation Technique | Discounted Cash Flow
Discount Rate | 1.64%
Duration | 4 years 6 months
Current Yield | 1.19%
Auction Rate Securities Owned [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 300,000
Valuation Adjustment | 21,000
Fair Value | $ 279,000
Valuation Technique | Discounted Cash Flow
Discount Rate | 2.49%
Duration | 7 years
Current Yield | 1.43%
Auction Rate Securities Owned [Member] | Other Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 3,625,000
Valuation Adjustment | 422,000
Fair Value | $ 3,203,000
Valuation Technique | Secondary Market Trading Activity
Percent of Par | 88.36%
Auction Rate Securities Owned [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 0.94%
Auction Rate Securities Owned [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.29%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.11%
Duration | 4 years
Current Yield | 0.77%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Municipal Auction Rate Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.64%
Duration | 4 years 6 months
Current Yield | 1.19%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.49%
Duration | 7 years
Current Yield | 1.43%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Other Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Percent of Par | 88.36%
Auction Rate Securities Purchase Commitment [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 26,867,000
Valuation Adjustment | (769,000)
Fair Value | 27,636,000
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 6,372,000
Valuation Adjustment | (911,000)
Fair Value | $ 7,283,000
Valuation Technique | Discounted Cash Flow
Duration | 4 years
Current Yield | 0.77%
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 20,495,000
Valuation Adjustment | 142,000
Fair Value | $ 20,353,000
Valuation Technique | Discounted Cash Flow
Duration | 4 years
Current Yield | 0.77%
Auction Rate Securities Purchase Commitment [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 0.94%
Auction Rate Securities Purchase Commitment [Member] | Minimum [Member] | Auction Rate Preferred Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 0.94%
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.29%
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Auction Rate Preferred Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.29%
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.11%
Duration | 4 years
Current Yield | 0.77%
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Auction Rate Preferred Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.11%
Duration | 4 years
Current Yield | 0.77%

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