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Note 5 - Fair Value of Financial Instruments - Assets Measured at Fair Value by Hierarchy Level (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities $ 134,304,000 $ 57,499,000
Other Investments 5,777,000 4,973,000
Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 6,669,097,000 6,786,469,000
Derivative, Fair Value, Net 6,116,000 5,513,000
Assets, Fair Value Disclosure 6,809,517,000 6,849,481,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net 0 0
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 616,035,000 551,695,000
Derivative, Fair Value, Net 0 0
Assets, Fair Value Disclosure 693,804,000 577,870,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 6,050,062,000 6,231,774,000
Derivative, Fair Value, Net 0 0
Assets, Fair Value Disclosure 6,106,597,000 6,263,098,000
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 3,000,000 3,000,000
Derivative, Fair Value, Net 6,116,000 5,513,000
Assets, Fair Value Disclosure 9,116,000 8,513,000
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 39,788,000 4,876,000
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 56,535,000 31,324,000
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | Equity securities    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 37,981,000 21,299,000
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 39,788,000 4,876,000
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 0 0
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Equity securities    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 37,981,000 21,299,000
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 0 0
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 56,535,000 31,324,000
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Equity securities    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 0 0
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 0 0
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 0 0
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Equity securities    
Fair Value by Hierarchy Level [Line Items]    
Less: loaned securities 0 0
Fixed-maturities available for sale | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 5,553,711,000 5,723,340,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 124,781,000 169,223,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 161,038,000 165,271,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 2,979,117,000 3,047,189,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | RMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 774,110,000 833,939,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 708,347,000 681,265,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CLO    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 562,588,000 568,558,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Other ABS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 238,337,000 252,457,000
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Foreign government and agency securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 5,393,000 5,438,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 94,491,000 140,034,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 94,491,000 140,034,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | RMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CLO    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Other ABS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Foreign government and agency securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 5,459,220,000 5,583,306,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 30,290,000 29,189,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 161,038,000 165,271,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 2,979,117,000 3,047,189,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | RMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 774,110,000 833,939,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 708,347,000 681,265,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CLO    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 562,588,000 568,558,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other ABS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 238,337,000 252,457,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Foreign government and agency securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 5,393,000 5,438,000
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | RMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | CLO    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Other ABS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Fixed-maturities available for sale | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Foreign government and agency securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Trading Securities | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 265,314,000 290,885,000
Trading Securities | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 98,544,000 120,449,000
Trading Securities | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 120,527,000 123,142,000
Trading Securities | Fair Value, Measurements, Recurring | RMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 12,015,000 13,000,000
Trading Securities | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 34,228,000 34,294,000
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | RMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 265,314,000 290,885,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 98,544,000 120,449,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 120,527,000 123,142,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | RMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 12,015,000 13,000,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 34,228,000 34,294,000
Trading Securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Trading Securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Trading Securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Trading Securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | RMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Trading Securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Equity securities | Fair Value, Measurements, Recurring | Equity securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 141,412,000 151,240,000
Equity securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Equity securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 134,439,000 142,761,000
Equity securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Equity securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 6,973,000 8,479,000
Equity securities | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Equity securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Short-term investments | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 705,660,000 618,004,000
Short-term investments | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 19,499,000  
Short-term investments | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 15,640,000 21,819,000
Short-term investments | Fair Value, Measurements, Recurring | Money market instruments    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 367,606,000 268,900,000
Short-term investments | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 35,910,000 30,495,000
Short-term investments | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 4,705,000  
Short-term investments | Fair Value, Measurements, Recurring | Other ABS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 786,000 219,000
Short-term investments | Fair Value, Measurements, Recurring | Other investments    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 261,514,000 296,571,000
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 387,105,000 268,900,000
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 19,499,000  
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Money market instruments    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 367,606,000 268,900,000
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0  
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Other ABS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Other investments    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 318,555,000 349,104,000
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0  
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 15,640,000 21,819,000
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Money market instruments    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 35,910,000 30,495,000
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 4,705,000  
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other ABS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 786,000 219,000
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other investments    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 261,514,000 296,571,000
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | U.S. government and agencies securities    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0  
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | State and municipal obligations    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Money market instruments    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Corporate bonds and notes    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | CMBS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0  
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Other ABS    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Short-term investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Other investments    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Other investments | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 3,000,000 3,000,000
Other investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Other investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 0
Other investments | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 3,000,000 3,000,000
Partnership investment | Investments Measured at NAV    
Fair Value by Hierarchy Level [Line Items]    
Other Investments $ 2,800,000 $ 2,000,000.0