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Note 4 - Fair Value of Financial Instruments Fair Value Assets Liabilities by Hierarchy Level (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Other Investments |  | $ 3,318,000 |  |  | $ 334,000 |
Securities Received as Collateral |  | 39,077,000 |  |  | 19,357,000 |
Loaned securities |  | 44,396,000 |  |  | 27,964,000 |
Gain (Loss) on Investments |  | (17,090,000) |  | $ (2,953,000) |  |
Other than Temporary Impairment Losses, Investments |  |  |  | 0 |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Other Investments |  | 3,300,000 |  |  |  |
Cost Method Investments | [1] | 0 |  |  | 334,000 |
Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 4,709,295,000 | [2],[3] |  | 4,671,572,000 | [4],[5]
Total Assets at Fair Value |  | 4,709,295,000 | [3] |  | 4,671,572,000 | [5]
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount |  | 0 |  | 0 |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount |  | 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 |  |
US government and agency securities | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 162,237,000 |  |  | 132,992,000 |
State and municipal obligations | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 372,465,000 |  |  | 386,111,000 |
Money market instruments | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 144,207,000 |  |  | 213,357,000 |
Corporate bonds and notes | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 2,298,885,000 |  |  | 2,304,017,000 |
RMBS | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 254,124,000 |  |  | 216,749,000 |
CMBS | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 520,468,000 |  |  | 503,955,000 |
Other ABS | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 736,518,000 |  |  | 676,158,000 |
Foreign government securities | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 36,576,000 |  |  | 36,448,000 |
Equity securities | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 138,041,000 |  |  | 176,065,000 |
Other investments | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 45,774,000 | [6] |  | 25,720,000 | [7]
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 434,713,000 | [2] |  | 513,531,000 | [4]
Total Assets at Fair Value |  | 434,713,000 |  |  | 513,531,000 |
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 |  | 154,347,000 |  |  | 124,969,000 |
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 |  | 144,207,000 |  |  | 213,357,000 |
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 securities | 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 |  | 136,159,000 |  |  | 175,205,000 |
Fair Value, Inputs, Level 1 | Other investments | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 0 | [6] |  | 0 | [7]
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 4,274,582,000 | [2] |  | 4,158,041,000 | [4]
Total Assets at Fair Value |  | 4,274,582,000 |  |  | 4,158,041,000 |
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 |  | 7,890,000 |  |  | 8,023,000 |
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 |  | 372,465,000 |  |  | 386,111,000 |
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 |  | 2,298,885,000 |  |  | 2,304,017,000 |
Fair Value, Inputs, Level 2 | RMBS | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 254,124,000 |  |  | 216,749,000 |
Fair Value, Inputs, Level 2 | CMBS | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 520,468,000 |  |  | 503,955,000 |
Fair Value, Inputs, Level 2 | Other ABS | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 736,518,000 |  |  | 676,158,000 |
Fair Value, Inputs, Level 2 | Foreign government securities | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 36,576,000 |  |  | 36,448,000 |
Fair Value, Inputs, Level 2 | Equity securities | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 1,882,000 |  |  | 860,000 |
Fair Value, Inputs, Level 2 | Other investments | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Total Investments at Fair Value |  | 45,774,000 | [6] |  | 25,720,000 | [7]
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 Reconciliations, Recurring Basis, Liability Value |  | 0 |  |  | 0 |
Securities Financing Transaction, Fair Value [Member] |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |
Securities Received as Collateral | [8],[9] | 39,077,000 |  |  | 19,357,000 |
Loaned securities | [9] | $ 44,396,000 |  |  | $ 27,964,000 |
[1] | As a result of implementing the update to the standard for the accounting of financial instruments effective January 1, 2018, other invested assets are no longer carried at amortized cost.
[2] | Does not include certain other invested assets ($3.3 million), primarily invested in limited partnership investments valued using the net asset value as a practical expedient. Includes cash collateral held under securities lending agreements ($39.1 million) reinvested in money market instruments.
[3] | Includes $44.4 million of securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our consolidated balance sheets. See Note 5 for more information.
[4] | 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.
[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 5 for more information.
[6] | Comprising short-term certificates of deposit and commercial paper.
[7] | Comprising short-term certificates of deposit and commercial paper.
[8] | All cash collateral received has been reinvested in accordance with the securities lending agreements and is included in short-term investments in our condensed consolidated balance sheets. Amounts payable on the return of cash collateral under securities lending agreements are included within other liabilities in our condensed consolidated balance sheets.
[9] | 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, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75027002&loc=d3e40346-111594 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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