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Note 4 - Fair Value of Financial Instruments Fair Value Assets Liabilities by Hierarchy Level (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Cost Method Investments | $ 1,293,000 |  |  | $ 1,293,000 |  |  | $ 1,714,000 |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 4,564,455,000 | [1] |  | 4,564,455,000 | [1] |  | 4,296,972,000 | [2]
Total Assets at Fair Value | 4,564,455,000 |  |  | 4,564,455,000 |  |  | 4,296,972,000 |
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 |  | $ 0 | 0 |  | $ 0 |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 |  | 0 | 0 |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net | 0 |  | 0 | 0 |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net | 0 |  | $ 0 | 0 |  | $ 0 |  |
US government and agency securities | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 152,805,000 |  |  | 152,805,000 |  |  | 678,328,000 |
State and municipal obligations | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 384,609,000 |  |  | 384,609,000 |  |  | 341,845,000 |
Money market instruments | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 587,628,000 |  |  | 587,628,000 |  |  | 443,272,000 |
Corporate bonds and notes | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 1,909,060,000 |  |  | 1,909,060,000 |  |  | 1,383,186,000 |
RMBS | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 433,474,000 |  |  | 433,474,000 |  |  | 297,097,000 |
CMBS | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 556,250,000 |  |  | 556,250,000 |  |  | 544,588,000 |
Other ABS | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 450,853,000 |  |  | 450,853,000 |  |  | 371,625,000 |
Foreign government securities | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 41,627,000 |  |  | 41,627,000 |  |  | 37,576,000 |
Equity securities | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 1,330,000 |  |  | 1,330,000 |  |  | 100,446,000 |
Other investments | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 46,819,000 | [3] |  | 46,819,000 | [3] |  | 99,009,000 | [4]
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 740,433,000 | [1] |  | 740,433,000 | [1] |  | 1,188,530,000 | [2]
Total Assets at Fair Value | 740,433,000 |  |  | 740,433,000 |  |  | 1,188,530,000 |
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 | 152,805,000 |  |  | 152,805,000 |  |  | 670,328,000 |
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 |  |  | 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 | 587,628,000 |  |  | 587,628,000 |  |  | 443,272,000 |
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 |  |  | 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 |  |  | 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 |  |  | 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 |  |  | 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 |  |  | 0 |
Fair Value, Inputs, Level 1 | Equity securities | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 0 |  |  | 0 |  |  | 74,930,000 |
Fair Value, Inputs, Level 1 | Other investments | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 0 | [3] |  | 0 | [3] |  | 0 | [4]
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 3,823,022,000 | [1] |  | 3,823,022,000 | [1] |  | 3,107,942,000 | [2]
Total Assets at Fair Value | 3,823,022,000 |  |  | 3,823,022,000 |  |  | 3,107,942,000 |
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 | 0 |  |  | 0 |  |  | 8,000,000 |
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 | 384,609,000 |  |  | 384,609,000 |  |  | 341,845,000 |
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 |  |  | 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 | 1,909,060,000 |  |  | 1,909,060,000 |  |  | 1,383,186,000 |
Fair Value, Inputs, Level 2 | RMBS | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 433,474,000 |  |  | 433,474,000 |  |  | 297,097,000 |
Fair Value, Inputs, Level 2 | CMBS | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 556,250,000 |  |  | 556,250,000 |  |  | 544,588,000 |
Fair Value, Inputs, Level 2 | Other ABS | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 450,853,000 |  |  | 450,853,000 |  |  | 371,625,000 |
Fair Value, Inputs, Level 2 | Foreign government securities | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 41,627,000 |  |  | 41,627,000 |  |  | 37,576,000 |
Fair Value, Inputs, Level 2 | Equity securities | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 830,000 |  |  | 830,000 |  |  | 25,016,000 |
Fair Value, Inputs, Level 2 | Other investments | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 46,319,000 | [3] |  | 46,319,000 | [3] |  | 99,009,000 | [4]
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 1,000,000 | [1] |  | 1,000,000 | [1] |  | 500,000 | [2]
Total Assets at Fair Value | $ 1,000,000 |  |  | $ 1,000,000 |  |  | 500,000 |
Total Level III Assets as a Percentage of Total Assets Measured at Fair Value (less than 0.1%) | 0.10% |  |  | 0.10% |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | $ 0 |  |  | $ 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 |  |  | 0 |  |  | 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 |  |  | 0 |  |  | 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 |  |  | 0 |  |  | 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 |  |  | 0 |  |  | 0 |
Fair Value, Inputs, Level 3 | RMBS | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 0 |  |  | 0 |  |  | 0 |
Fair Value, Inputs, Level 3 | CMBS | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 0 |  |  | 0 |  |  | 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 |  |  | 0 |  |  | 0 |
Fair Value, Inputs, Level 3 | Foreign government securities | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 0 |  |  | 0 |  |  | 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 |  |  | 500,000 |  |  | 500,000 |
Gain (Loss) on Investments | 0 |  |  |  |  |  | 0 |
Fair Value, Inputs, Level 3 | Other investments | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Investments at Fair Value | 500,000 | [3] |  | $ 500,000 | [3] |  | $ 0 | [4]
Gain (Loss) on Investments | $ 0 |  |  |  |  |  |  |
Maximum [Member] | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |  |
Total Level III Assets as a Percentage of Total Assets Measured at Fair Value (less than 0.1%) |  |  |  |  |  |  | 0.10% |
[1] | Does not include certain other invested assets ($1.3 million), primarily invested in limited partnerships, accounted for as cost-method investments and not measured at fair value.
[2] | Does not include certain other invested assets ($1.7 million), primarily invested in limited partnerships, accounted for as cost-method investments and not measured at fair value.
[3] | Comprising short-term certificates of deposit and commercial paper, included within Level II, and private convertible notes, included within Level III.
[4] | Comprising short-term certificates of deposit and commercial paper.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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=6872867&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=29638308&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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + 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=73527792&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=66902209&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=73527792&loc=d3e27405-111563 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + 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 -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 6: 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(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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