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Note 4 - Fair Value of Financial Instruments Assets Measured at Fair Value by Hierarchy Level (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Other Investments |  | $ 3,059,000 |  |  | $ 3,415,000 |
Reinvested cash collateral held under securities lending agreements |  | 6,233,000 |  |  | 11,699,000 |
Loaned securities |  | 22,606,000 |  |  | 27,860,000 |
Carrying (Reported) Amount, Fair Value Disclosure |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Other Investments |  | 3,100,000 |  |  | 3,400,000 |
Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 5,495,317,000 | [1],[2] |  | 5,177,474,000 | [3],[4]
Total Assets at Fair Value |  | 5,495,317,000 | [2],[5] |  | 5,177,474,000 | [4],[6]
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, Measurements, Recurring | US government and agency securities |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 212,518,000 |  |  | 227,714,000 |
Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 233,827,000 |  |  | 324,742,000 |
Fair Value, Measurements, Recurring | Money market instruments |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 174,541,000 |  |  | 95,132,000 |
Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 2,485,463,000 |  |  | 2,564,068,000 |
Fair Value, Measurements, Recurring | RMBS |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 368,495,000 |  |  | 353,224,000 |
Fair Value, Measurements, Recurring | CMBS |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 549,986,000 |  |  | 591,393,000 |
Fair Value, Measurements, Recurring | Other ABS |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 675,477,000 |  |  | 705,468,000 |
Fair Value, Measurements, Recurring | Equity securities |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 141,105,000 |  |  | 140,620,000 |
Fair Value, Measurements, Recurring | Other investments |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 653,905,000 | [7] |  | 175,113,000 | [8]
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 489,556,000 | [1] |  | 431,096,000 | [3]
Total Assets at Fair Value |  | 489,556,000 | [5] |  | 431,096,000 | [6]
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 |  | 178,908,000 |  |  | 199,302,000 |
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 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Money market instruments |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 174,541,000 |  |  | 95,132,000 |
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 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | RMBS |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  |  | 0 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CMBS |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  |  | 0 |
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 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Equity securities |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 136,107,000 |  |  | 136,662,000 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Other investments |  |  |  |  |  |
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 |  | 5,005,761,000 | [1] |  | 4,746,378,000 | [3]
Total Assets at Fair Value |  | 5,005,761,000 | [5] |  | 4,746,378,000 | [6]
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 |  | 33,610,000 |  |  | 28,412,000 |
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 |  | 233,827,000 |  |  | 324,742,000 |
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 |
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 |  | 2,485,463,000 |  |  | 2,564,068,000 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | RMBS |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 368,495,000 |  |  | 353,224,000 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 549,986,000 |  |  | 591,393,000 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other ABS |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 675,477,000 |  |  | 705,468,000 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Equity securities |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 4,998,000 |  |  | 3,958,000 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other investments |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 653,905,000 | [7] |  | 175,113,000 | [8]
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Assets at Fair Value |  | 0 |  |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value |  | 0 |  |  | 0 |
Securities Financing Transaction, Fair Value |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Reinvested cash collateral held under securities lending agreements | [9] | 17,372,000 |  |  | 16,815,000 |
Loaned securities | [10] | 22,606,000 |  |  | 27,860,000 |
Securities Financing Transaction, Fair Value | Corporate bonds and notes |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Loaned securities | [10] | 6,526,000 |  |  | 7,818,000 |
Securities Financing Transaction, Fair Value | Equity securities |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Loaned securities | [10] | $ 16,080,000 |  |  | $ 10,055,000 |
[1] | Does not include certain other invested assets of $3.1 million that are 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 $6.2 million that is reinvested in money market instruments.
[2] | Includes $22.6 million of securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our condensed consolidated balance sheets. See Note 5 for more information.
[3] | Does not include certain 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. Includes cash collateral held under securities lending agreements of $11.7 million that is reinvested in money market instruments.
[4] | Includes $27.9 million of securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our condensed consolidated balance sheets. See Note 5 for more information.
[5] | 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 condensed consolidated balance sheet. See Note 7 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 condensed consolidated balance sheet. See Note 7 for more information.
[7] | Comprising short-term certificates of deposit and commercial paper.
[8] | Comprising short-term certificates of deposit and commercial paper.
[9] | Securities collateral on deposit with us from Borrowers may not be transferred or re-pledged unless the Borrower is in default, and is therefore not reflected in our condensed consolidated financial statements.
[10] | Our securities loaned under securities lending agreements are reported at fair value within other assets in our condensed consolidated balance sheets. All of our securities lending agreements are classified as overnight and revolving. None of the amounts are subject to offsetting.

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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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