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Note 4 - Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | The following is a list of assets that are measured at fair value by hierarchy level as of June 30, 2018:
(In thousands) | Level I |  | Level II |  | Total |
Assets at Fair Value |  |  |  |  |  |
Investment Portfolio: |  |  |  |  |  |
U.S. government and agency securities | $ | 137,749 |  |  | $ | 19,457 |  |  | $ | 157,206 |  |
State and municipal obligations | — |  |  | 351,085 |  |  | 351,085 |  |
Money market instruments | 211,348 |  |  | — |  |  | 211,348 |  |
Corporate bonds and notes | — |  |  | 2,331,887 |  |  | 2,331,887 |  |
RMBS | — |  |  | 268,449 |  |  | 268,449 |  |
CMBS | — |  |  | 527,098 |  |  | 527,098 |  |
Other ABS | — |  |  | 693,672 |  |  | 693,672 |  |
Foreign government and agency securities | — |  |  | 50,433 |  |  | 50,433 |  |
Equity securities | 139,637 |  |  | 5,269 |  |  | 144,906 |  |
Other investments (1) | — |  |  | 172,993 |  |  | 172,993 |  |
Total Investments at Fair Value (2) | 488,734 |  |  | 4,420,343 |  |  | 4,909,077 |  | (3)
Total Assets at Fair Value | $ | 488,734 |  |  | $ | 4,420,343 |  |  | $ | 4,909,077 |  | (3)
______________________
(1) | Comprising short-term certificates of deposit and commercial paper.
(2) | Does not include certain other invested assets ($3.2 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 ($39.2 million) reinvested in money market instruments.
(3) | Includes $38.4 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.
The following is a list of assets that are measured at fair value by hierarchy level as of December 31, 2017:
(In thousands) | Level I |  | Level II |  | Total |
Assets at Fair Value |  |  |  |  |  |
Investment Portfolio: |  |  |  |  |  |
U.S. government and agency securities | $ | 124,969 |  |  | $ | 8,023 |  |  | $ | 132,992 |  |
State and municipal obligations | — |  |  | 386,111 |  |  | 386,111 |  |
Money market instruments | 213,357 |  |  | — |  |  | 213,357 |  |
Corporate bonds and notes | — |  |  | 2,304,017 |  |  | 2,304,017 |  |
RMBS | — |  |  | 216,749 |  |  | 216,749 |  |
CMBS | — |  |  | 503,955 |  |  | 503,955 |  |
Other ABS | — |  |  | 676,158 |  |  | 676,158 |  |
Foreign government and agency securities | — |  |  | 36,448 |  |  | 36,448 |  |
Equity securities | 175,205 |  |  | 860 |  |  | 176,065 |  |
Other investments (1) | — |  |  | 25,720 |  |  | 25,720 |  |
Total Investments at Fair Value (2) | 513,531 |  |  | 4,158,041 |  |  | 4,671,572 |  | (3)
Total Assets at Fair Value | $ | 513,531 |  |  | $ | 4,158,041 |  |  | $ | 4,671,572 |  | (3)
______________________
(1) | Comprising short-term certificates of deposit and commercial paper.
(2) | 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.
(3) | 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.
Fair Value, by Balance Sheet Grouping [Table Text Block] | The carrying value and estimated fair value of other selected assets and liabilities not carried at fair value in our condensed consolidated balance sheets were as follows as of the dates indicated:
| June 30, 2018 |  | December 31, 2017
(In thousands) | Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
Assets: |  |  |  |  |  |  |
Other invested assets (1) | $ | — |  |  | $ | — |  |  | $ | 334 |  |  | $ | 3,226 |
Liabilities: |  |  |  |  |  |  |
Senior notes | 1,028,687 |  |  | 1,040,249 |  |  | 1,027,074 |  |  | 1,093,934 |
______________________
(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.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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