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Note 5 - Fair Value of Financial Instruments Fair Value Assets Liabilities by Hierarchy Level (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value by Hierarchy Level [Line Items]    
Other Investments $ 3,415 $ 334
Securities Received as Collateral 11,700 19,357
Loaned securities 27,860 27,964
Total liabilities 2,825,937 2,900,843
Carrying (Reported) Amount, Fair Value Disclosure    
Fair Value by Hierarchy Level [Line Items]    
Other Investments 3,400  
Cost Method Investments [1] 0 334
Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 5,177,474 [2],[3] 4,671,572 [4],[5]
Total Assets at Fair Value 5,177,474 [3],[6] 4,671,572 [5]
US government and agency securities | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 227,714 132,992
State and municipal obligations | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 324,742 386,111
Money market instruments | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 95,132 213,357
Corporate bonds and notes | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 2,564,068 2,304,017
RMBS | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 353,224 216,749
CMBS | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 591,393 503,955
Other ABS | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 705,468 676,158
Foreign government and agency securities | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value   36,448
Equity securities available for sale | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 140,620 176,065
Other investments | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 175,113 [7] 25,720 [8]
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 431,096 [2] 513,531 [4]
Total Assets at Fair Value 431,096 [6] 513,531
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 199,302 124,969
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 95,132 213,357
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 and agency securities | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value   0
Fair Value, Inputs, Level 1 | Equity securities available for sale | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 136,662 175,205
Fair Value, Inputs, Level 1 | Other investments | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 0 [7] 0 [8]
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 4,746,378 [2] 4,158,041 [4]
Total Assets at Fair Value 4,746,378 [6] 4,158,041
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 28,412 8,023
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 324,742 386,111
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 2,564,068 2,304,017
Fair Value, Inputs, Level 2 | RMBS | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 353,224 216,749
Fair Value, Inputs, Level 2 | CMBS | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 591,393 503,955
Fair Value, Inputs, Level 2 | Other ABS | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 705,468 676,158
Fair Value, Inputs, Level 2 | Foreign government and agency securities | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value   36,448
Fair Value, Inputs, Level 2 | Equity securities available for sale | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 3,958 860
Fair Value, Inputs, Level 2 | Other investments | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Investments at Fair Value 175,113 [7] 25,720 [8]
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring    
Fair Value by Hierarchy Level [Line Items]    
Total Assets at Fair Value 0 0
Total liabilities 0 0
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
Securities Financing Transaction, Fair Value    
Fair Value by Hierarchy Level [Line Items]    
Securities Received as Collateral [9] 11,699 19,357
Loaned securities [10] 27,860 $ 27,964
Securities Financing Transaction, Fair Value | Equity securities available for sale    
Fair Value by Hierarchy Level [Line Items]    
Loaned securities $ 10,400  
[1] As a result of implementing the update to the standard for the accounting of financial instruments effective January 1, 2018, other invested assets, primarily consisting of investments in limited partnerships, are no longer carried at amortized cost, and instead are valued in our consolidated balance sheets using the net asset value as a practical expedient to estimate fair value.
[2] Does not include certain other invested assets of $3.4 million that is primarily invested in limited partnership investments valued using the net asset value as a practical expedient. Includes cash collateral held under securities lending agreements of $11.7 million that is reinvested in money market instruments.
[3] Includes $27.9 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.
[4] Does not include certain other invested assets of $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 of $19.4 million reinvested in money market instruments.
[5] 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.
[6] Does not include the fair value of an immaterial embedded derivative, which we have accounted for separately as a freestanding derivative and classified in other assets in our consolidated balance sheet. See Note 8 for more information.
[7] Comprising short-term certificates of deposit and commercial paper.
[8] Comprising short-term certificates of deposit and commercial paper.
[9] All cash collateral received has been reinvested in accordance with the securities lending agreements and is included in short-term investments in our consolidated balance sheets. Amounts payable on the return of cash collateral under securities lending agreements are included within other liabilities in our consolidated balance sheets.
[10] Our securities loaned under securities lending agreements are reported at fair value within other assets in our consolidated balance sheets. All of our securities lending agreements are classified as overnight and revolving. None of the amounts are subject to offsetting.