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Note 4 - Fair Value of Financial Instruments Assets Measured at Fair Value by Hierarchy Level (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Fair Value by Hierarchy Level [Line Items]      
Loaned securities $ 65,444,000 $ 65,444,000 $ 27,860,000
Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 5,531,012,000 [1] 5,531,012,000 [1] 5,149,614,000 [2]
Assets, Fair Value Disclosure 5,596,456,000 [1] 5,596,456,000 [1] 5,177,474,000 [2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net 0 0 0
Fair Value, Measurements, Recurring | Investments Measured at NAV      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 2,700,000 2,700,000 3,400,000
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 562,546,000 [1] 562,546,000 [1] 411,054,000 [2]
Assets, Fair Value Disclosure 612,763,000 [1] 612,763,000 [1] 431,096,000 [2]
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 4,968,466,000 [1] 4,968,466,000 [1] 4,738,560,000 [2]
Assets, Fair Value Disclosure 4,983,693,000 [1] 4,983,693,000 [1] 4,746,378,000 [2]
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Assets, Fair Value Disclosure 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value 0 0 0
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | US government and agency securities      
Fair Value by Hierarchy Level [Line Items]      
Loaned securities 19,960,000 [3] 19,960,000 [3] 9,987,000 [4]
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | Corporate bonds and notes      
Fair Value by Hierarchy Level [Line Items]      
Loaned securities 15,227,000 [3] 15,227,000 [3] 7,818,000 [4]
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | Equity securities      
Fair Value by Hierarchy Level [Line Items]      
Loaned securities 30,257,000 [3] 30,257,000 [3] 10,055,000 [4]
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | US government and agency securities      
Fair Value by Hierarchy Level [Line Items]      
Loaned securities 19,960,000 [3] 19,960,000 [3] 9,987,000 [4]
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]      
Loaned securities 0 [3] 0 [3] 0 [4]
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Equity securities      
Fair Value by Hierarchy Level [Line Items]      
Loaned securities 30,257,000 [3] 30,257,000 [3] 10,055,000 [4]
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US government and agency securities      
Fair Value by Hierarchy Level [Line Items]      
Loaned securities 0 [3] 0 [3] 0 [4]
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]      
Loaned securities 15,227,000 [3] 15,227,000 [3] 7,818,000 [4]
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Equity securities      
Fair Value by Hierarchy Level [Line Items]      
Loaned securities 0 [3] 0 [3] 0 [4]
Fixed maturities | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 4,527,223,000 4,527,223,000 4,021,575,000
Fixed maturities | Fair Value, Measurements, Recurring | US government and agency securities      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 162,455,000 162,455,000 84,070,000
Fixed maturities | Fair Value, Measurements, Recurring | State and municipal obligations      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 110,981,000 110,981,000 138,313,000
Fixed maturities | Fair Value, Measurements, Recurring | Corporate bonds and notes      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 2,347,346,000 2,347,346,000 2,222,473,000
Fixed maturities | Fair Value, Measurements, Recurring | RMBS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 619,935,000 619,935,000 332,142,000
Fixed maturities | Fair Value, Measurements, Recurring | CMBS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 563,338,000 563,338,000 539,915,000
Fixed maturities | Fair Value, Measurements, Recurring | Other ABS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 717,986,000 717,986,000 704,662,000
Fixed maturities | Fair Value, Measurements, Recurring | Foreign government and agency securities      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 5,182,000 5,182,000  
Fixed maturities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 128,443,000 128,443,000 55,658,000
Fixed maturities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | US government and agency securities      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 128,443,000 128,443,000 55,658,000
Fixed maturities | 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 0
Fixed maturities | 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 0
Fixed maturities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | RMBS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 0 0 0
Fixed maturities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CMBS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 0 0 0
Fixed maturities | 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 0
Fixed maturities | 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 | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 4,398,780,000 4,398,780,000 3,965,917,000
Fixed maturities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US government and agency securities      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 34,012,000 34,012,000 28,412,000
Fixed maturities | 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 110,981,000 110,981,000 138,313,000
Fixed maturities | 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 2,347,346,000 2,347,346,000 2,222,473,000
Fixed maturities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | RMBS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 619,935,000 619,935,000 332,142,000
Fixed maturities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 563,338,000 563,338,000 539,915,000
Fixed maturities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other ABS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 717,986,000 717,986,000 704,662,000
Fixed maturities | 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 5,182,000 5,182,000  
Trading Securities | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 329,935,000 329,935,000 469,071,000
Trading Securities | Fair Value, Measurements, Recurring | State and municipal obligations      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 121,190,000 121,190,000 168,359,000
Trading Securities | Fair Value, Measurements, Recurring | Corporate bonds and notes      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 156,648,000 156,648,000 228,152,000
Trading Securities | Fair Value, Measurements, Recurring | RMBS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 17,116,000 17,116,000 21,082,000
Trading Securities | Fair Value, Measurements, Recurring | CMBS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 34,981,000 34,981,000 51,478,000
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 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 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 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 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 0
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 329,935,000 329,935,000 469,071,000
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 121,190,000 121,190,000 168,359,000
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 156,648,000 156,648,000 228,152,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | RMBS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 17,116,000 17,116,000 21,082,000
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 34,981,000 34,981,000 51,478,000
Equity securities | Fair Value, Measurements, Recurring | Equity securities      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 121,759,000 121,759,000 130,565,000
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 116,762,000 116,762,000 126,607,000
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 4,997,000 4,997,000 3,958,000
Short-term Investments | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 552,095,000 552,095,000 528,403,000
Short-term Investments | Fair Value, Measurements, Recurring | US government and agency securities      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 120,969,000 120,969,000 133,657,000
Short-term Investments | Fair Value, Measurements, Recurring | State and municipal obligations      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 25,547,000 25,547,000 18,070,000
Short-term Investments | Fair Value, Measurements, Recurring | Money market instruments      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 196,372,000 196,372,000 95,132,000
Short-term Investments | Fair Value, Measurements, Recurring | Corporate bonds and notes      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 37,593,000 37,593,000 105,625,000
Short-term Investments | Fair Value, Measurements, Recurring | Other ABS      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value     806,000
Short-term Investments | Fair Value, Measurements, Recurring | Other investments      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 171,614,000 [5] 171,614,000 [5] 175,113,000 [6]
Short-term Investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 317,341,000 317,341,000 228,789,000
Short-term Investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | US government and agency securities      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 120,969,000 120,969,000 133,657,000
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 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 196,372,000 196,372,000 95,132,000
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 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
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 [5] 0 [5] 0 [6]
Short-term Investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 234,754,000 234,754,000 299,614,000
Short-term Investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US government and agency securities      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 0 0 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 25,547,000 25,547,000 18,070,000
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 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 37,593,000 37,593,000 105,625,000
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     806,000
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 $ 171,614,000 [5] $ 171,614,000 [5] $ 175,113,000 [6]
[1]
Does not include other invested assets of $2.7 million that are primarily invested in limited partnership investments valued using the net asset value as a practical expedient.
[2] Does not include other invested assets of $3.4 million that are primarily invested in limited partnership investments valued using the net asset value as a practical expedient.
[3]
Securities loaned to third-party borrowers under securities lending agreements are classified as other assets in our condensed consolidated balance sheets. See Note 5 for more information.
[4]
Securities loaned to third-party borrowers under securities lending agreements are classified as other assets in our condensed consolidated balance sheets. See Note 5 for more information.
[5]
Comprising short-term certificates of deposit and commercial paper.
[6]
Comprising short-term certificates of deposit and commercial paper.