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Note 4 - Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2019
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 March 31, 2019:
(In thousands) | Level I |  | Level II |  | Total |
Assets at Fair Value |  |  |  |  |  |
Investment Portfolio: |  |  |  |  |  |
U.S. government and agency securities | $ | 178,908 |  |  | $ | 33,610 |  |  | $ | 212,518 |  |
State and municipal obligations | — |  |  | 233,827 |  |  | 233,827 |  |
Money market instruments | 174,541 |  |  | — |  |  | 174,541 |  |
Corporate bonds and notes | — |  |  | 2,485,463 |  |  | 2,485,463 |  |
RMBS | — |  |  | 368,495 |  |  | 368,495 |  |
CMBS | — |  |  | 549,986 |  |  | 549,986 |  |
Other ABS | — |  |  | 675,477 |  |  | 675,477 |  |
Equity securities | 136,107 |  |  | 4,998 |  |  | 141,105 |  |
Other investments (1) | — |  |  | 653,905 |  |  | 653,905 |  |
Total Investments at Fair Value (2) | 489,556 |  |  | 5,005,761 |  |  | 5,495,317 |  | (3)
Total Assets at Fair Value (4) | $ | 489,556 |  |  | $ | 5,005,761 |  |  | $ | 5,495,317 |  | (3)
______________________
(1) | Comprising short-term certificates of deposit and commercial paper.
(2) | 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.
(3) | 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.
(4) | 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.
The following is a list of assets that are measured at fair value by hierarchy level as of December 31, 2018:
(In thousands) | Level I |  | Level II |  | Total |
Assets at Fair Value |  |  |  |  |  |
Investment Portfolio: |  |  |  |  |  |
U.S. government and agency securities | $ | 199,302 |  |  | $ | 28,412 |  |  | $ | 227,714 |  |
State and municipal obligations | — |  |  | 324,742 |  |  | 324,742 |  |
Money market instruments | 95,132 |  |  | — |  |  | 95,132 |  |
Corporate bonds and notes | — |  |  | 2,564,068 |  |  | 2,564,068 |  |
RMBS | — |  |  | 353,224 |  |  | 353,224 |  |
CMBS | — |  |  | 591,393 |  |  | 591,393 |  |
Other ABS | — |  |  | 705,468 |  |  | 705,468 |  |
Equity securities | 136,662 |  |  | 3,958 |  |  | 140,620 |  |
Other investments (1) | — |  |  | 175,113 |  |  | 175,113 |  |
Total Investments at Fair Value (2) | 431,096 |  |  | 4,746,378 |  |  | 5,177,474 |  | (3)
Total Assets at Fair Value (4) | $ | 431,096 |  |  | $ | 4,746,378 |  |  | $ | 5,177,474 |  | (3)
______________________
(1) | Comprising short-term certificates of deposit and commercial paper.
(2) | 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.
(3) | 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.
(4) 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.
Fair Value, by Balance Sheet Grouping [Table Text Block] | The carrying value and estimated fair value of other selected liabilities not carried at fair value in our condensed consolidated balance sheets were as follows as of the dates indicated:
| March 31, 2019 |  | December 31, 2018
(In thousands) | Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
Liabilities: |  |  |  |  |  |  |
Senior notes | $ | 1,031,197 |  |  | $ | 1,051,418 |  |  | $ | 1,030,348 |  |  | $ | 1,007,687 |
FHLB advances | 108,532 |  |  | 109,097 |  |  | 82,532 |  |  | 82,899 |
The fair value of our senior notes is estimated based on the quoted market prices for the same or similar instruments. The fair value of our FHLB advances is estimated based on expected cash flows for similar borrowings. These liabilities are categorized in Level II of the fair value hierarchy.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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