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Note 5 - Fair Value of Financial Instruments Fair Value Assets Liabilities by Hierarchy Level (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value by Hierarchy Level [Line Items]      
Securities Received as Collateral $ 19,357,000 $ 0  
Securities Loaned, Asset 27,964,000    
Net gains (losses) on investments and other financial instruments 3,207,000 31,004,000 $ 35,081,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0 0  
Total liabilities 2,900,843,000 2,990,888,000  
Reported Value Measurement [Member]      
Fair Value by Hierarchy Level [Line Items]      
Cost Method Investments 334,000 1,195,000  
Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 4,671,572,000 [1],[2] 4,461,235,000 [3]  
Total Assets at Fair Value 4,671,572,000 [2] 4,461,235,000  
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0 0  
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net 0 0  
US government and agency securities | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 132,992,000 237,479,000  
State and municipal obligations | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 386,111,000 358,536,000  
Money market instruments | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 213,357,000 431,472,000  
Corporate bonds and notes | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 2,304,017,000 2,024,205,000  
RMBS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 216,749,000 388,842,000  
CMBS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 503,955,000 507,273,000  
Other ABS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 676,158,000 450,128,000  
Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 36,448,000 32,807,000  
Equity securities | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 176,065,000 1,330,000  
Other investments | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 25,720,000 [4] 29,163,000 [5]  
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 513,531,000 [1] 668,951,000 [3]  
Total Assets at Fair Value 513,531,000 668,951,000  
Fair Value, Inputs, Level 1 | US government and agency securities | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 124,969,000 237,479,000  
Fair Value, Inputs, Level 1 | State and municipal obligations | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 0 0  
Fair Value, Inputs, Level 1 | Money market instruments | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 213,357,000 431,472,000  
Fair Value, Inputs, Level 1 | Corporate bonds and notes | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 0 0  
Fair Value, Inputs, Level 1 | RMBS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 0 0  
Fair Value, Inputs, Level 1 | CMBS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 0 0  
Fair Value, Inputs, Level 1 | Other ABS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 0 0  
Fair Value, Inputs, Level 1 | Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 0 0  
Fair Value, Inputs, Level 1 | Equity securities | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 175,205,000 0  
Fair Value, Inputs, Level 1 | Other investments | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 0 [4] 0 [5]  
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 4,158,041,000 [1] 3,791,284,000 [3]  
Total Assets at Fair Value 4,158,041,000 3,791,284,000  
Fair Value, Inputs, Level 2 | US government and agency securities | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 8,023,000 0  
Fair Value, Inputs, Level 2 | State and municipal obligations | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 386,111,000 358,536,000  
Fair Value, Inputs, Level 2 | Money market instruments | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 0 0  
Fair Value, Inputs, Level 2 | Corporate bonds and notes | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 2,304,017,000 2,024,205,000  
Fair Value, Inputs, Level 2 | RMBS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 216,749,000 388,842,000  
Fair Value, Inputs, Level 2 | CMBS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 503,955,000 507,273,000  
Fair Value, Inputs, Level 2 | Other ABS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 676,158,000 450,128,000  
Fair Value, Inputs, Level 2 | Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 36,448,000 32,807,000  
Fair Value, Inputs, Level 2 | Equity securities | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 860,000 830,000  
Fair Value, Inputs, Level 2 | Other investments | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value 25,720,000 [4] 28,663,000 [5]  
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value [3]   1,000,000  
Total Assets at Fair Value   $ 1,000,000  
Total Level III Assets as a Percentage of Total Assets Measured at Fair Value is Less Than   0.10%  
Total liabilities 0 $ 0  
Fair Value, Inputs, Level 3 | US government and agency securities | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value   0  
Fair Value, Inputs, Level 3 | State and municipal obligations | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value   0  
Fair Value, Inputs, Level 3 | Money market instruments | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value   0  
Fair Value, Inputs, Level 3 | Corporate bonds and notes | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value   0  
Fair Value, Inputs, Level 3 | RMBS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value   0  
Fair Value, Inputs, Level 3 | CMBS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value   0  
Fair Value, Inputs, Level 3 | Other ABS | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value   0  
Fair Value, Inputs, Level 3 | Foreign Government Debt Securities [Member] | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value   0  
Fair Value, Inputs, Level 3 | Equity securities | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value   500,000  
Total Assets at Fair Value 0 1,000,000  
Net gains (losses) on investments and other financial instruments   0  
Fair Value, Inputs, Level 3 | Other investments | Fair Value, Measurements, Recurring      
Fair Value by Hierarchy Level [Line Items]      
Total Investments at Fair Value [5]   500,000  
Net gains (losses) on investments and other financial instruments   $ 0  
Securities Financing Transaction, Fair Value [Member]      
Fair Value by Hierarchy Level [Line Items]      
Securities Received as Collateral [6] 19,357,000    
Securities Loaned, Asset [7] $ 27,964,000    
[1] Does not include certain other invested assets ($0.3 million), primarily invested in limited partnerships, accounted for as cost-method investments and not measured at fair value. Includes cash collateral held under securities lending agreements ($19.4 million) reinvested in money market instruments.
[2] Includes $28.0 million of securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our consolidated balance sheets. See Note 6 for more information.
[3] Does not include certain other invested assets ($1.2 million), primarily invested in limited partnerships, accounted for as cost-method investments and not measured at fair value.
[4] Comprising short-term certificates of deposit and commercial paper.
[5] Comprising short-term certificates of deposit and commercial paper.
[6] All cash collateral received has been reinvested in accordance with the securities lending agreements and is included in short-term investments. Amounts payable on the return of cash collateral under securities lending agreements are included within other liabilities on our consolidated balance sheets.
[7] Our securities loaned under securities lending agreements are included at fair value within other assets on our consolidated balance sheets. All of our securities lending agreements are classified as overnight and revolving. None of the amounts are subject to offsetting.