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Note 5 - Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments [Abstract] |
Schedule of Securities Financing Transactions [Table Text Block] | Key components of our securities lending agreements at March 31, 2018 and December 31, 2017 consisted of the following:
(In thousands) | March 31, 2018 |  | December 31, 2017
Loaned securities (1): |  |  |
U.S. government and agency securities | $ | 975 |  |  | $ | — |
Corporate bonds and notes | 15,508 |  |  | 13,862 |
Foreign government and agency securities | 904 |  |  | 867 |
Equity securities | 27,009 |  |  | 13,235 |
Total loaned securities, at fair value | $ | 44,396 |  |  | $ | 27,964 |
Total loaned securities, at amortized cost | $ | 45,266 |  |  | $ | 27,846 |
Securities collateral on deposit from Borrowers (2) | 6,345 |  |  | 9,342 |
Reinvested cash collateral, at estimated fair value (3) | 39,077 |  |  | 19,357 |
______________________
(1) | 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.
(2) | 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.
(3) | 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.
Unrealized Gain (Loss) on Investments [Table Text Block] | Our available for sale securities within our investment portfolio consisted of the following as of the dates indicated:
| March 31, 2018
(In thousands) | Amortized Cost |  | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses
Fixed-maturities available for sale: |  |  |  |  |  |  |
U.S. government and agency securities | $ | 65,278 |  |  | $ | 63,656 |  | (1) | $ | — |  |  | $ | 1,622 |
State and municipal obligations | 157,176 |  |  | 159,329 |  |  | 3,882 |  |  | 1,729 |
Corporate bonds and notes | 1,910,482 |  |  | 1,881,117 |  |  | 10,525 |  |  | 39,890 |
RMBS | 233,144 |  |  | 228,040 |  | (2) | 128 |  |  | 5,232 |
CMBS | 476,601 |  |  | 470,834 |  |  | 1,085 |  |  | 6,852 |
Other ABS | 736,967 |  |  | 736,518 |  |  | 1,819 |  |  | 2,268 |
Foreign government and agency securities | 32,412 |  |  | 32,396 |  |  | 257 |  |  | 273 |
Total fixed-maturities available for sale | $ | 3,612,060 |  |  | $ | 3,571,890 |  | (3) | $ | 17,696 |  |  | $ | 57,866 |
______________________
(1) | Includes securities with a fair value of $4.8 million serving as collateral for FHLB advances.
(2) | Includes securities with a fair value of $23.3 million serving as collateral for FHLB advances.
(3) | Includes $17.2 million of fixed maturity securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our condensed consolidated balance sheets, as further described below.
| December 31, 2017
(In thousands) | Amortized Cost |  | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses
Fixed-maturities available for sale: |  |  |  |  |  |  |
U.S. government and agency securities | $ | 69,667 |  |  | $ | 69,396 |  |  | $ | 96 |  |  | $ | 367 |
State and municipal obligations | 156,587 |  |  | 161,722 |  |  | 5,834 |  |  | 699 |
Corporate bonds and notes | 1,869,318 |  |  | 1,894,886 |  |  | 33,620 |  |  | 8,052 |
RMBS | 189,455 |  |  | 187,229 |  |  | 636 |  |  | 2,862 |
CMBS | 451,595 |  |  | 453,394 |  |  | 3,409 |  |  | 1,610 |
Other ABS | 672,715 |  |  | 674,548 |  |  | 2,655 |  |  | 822 |
Foreign government and agency securities | 31,417 |  |  | 32,207 |  |  | 823 |  |  | 33 |
Total fixed-maturities available for sale | 3,440,754 |  |  | 3,473,382 |  | (1) | 47,073 |  |  | 14,445 |
Equity securities available for sale (2) | 176,349 |  |  | 176,065 |  | (1) | 1,705 |  |  | 1,989 |
Total debt and equity securities | $ | 3,617,103 |  |  | $ | 3,649,447 |  |  | $ | 48,778 |  |  | $ | 16,434 |
______________________
(1) | Includes $14.7 million of fixed maturity securities and $13.2 million of equity securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our condensed consolidated balance sheets, as further described below.
(2) | Primarily consists of investments in fixed-income and equity exchange-traded funds and publicly-traded business development company equities.
Schedule Of Unrealized Losses [Table Text Block] | the following tables show the gross unrealized losses and fair values, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, as of the dates indicated. Included in the amounts as of March 31, 2018 and December 31, 2017, are loaned securities under securities lending agreements that are classified as other assets in our condensed consolidated balance sheets, as further described below.
| March 31, 2018
($ in thousands) Description of Securities | Less Than 12 Months |  | 12 Months or Greater |  | Total
# of securities |  | Fair Value |  | Unrealized Losses |  | # of securities |  | Fair Value |  | Unrealized Losses |  | # of securities |  | Fair Value |  | Unrealized Losses
U.S. government and agency securities | 7 |  |  | $ | 41,246 |  |  | $ | 1,116 |  |  | 3 |  |  | $ | 9,520 |  |  | $ | 506 |  |  | 10 |  |  | $ | 50,766 |  |  | $ | 1,622 |
State and municipal obligations | 28 |  |  | 79,897 |  |  | 1,729 |  |  | — |  |  | — |  |  | — |  |  | 28 |  |  | 79,897 |  |  | 1,729 |
Corporate bonds and notes | 344 |  |  | 1,348,488 |  |  | 32,623 |  |  | 28 |  |  | 127,265 |  |  | 7,267 |  |  | 372 |  |  | 1,475,753 |  |  | 39,890 |
RMBS | 20 |  |  | 112,041 |  |  | 1,606 |  |  | 27 |  |  | 79,087 |  |  | 3,626 |  |  | 47 |  |  | 191,128 |  |  | 5,232 |
CMBS | 67 |  |  | 375,353 |  |  | 6,592 |  |  | 5 |  |  | 2,814 |  |  | 260 |  |  | 72 |  |  | 378,167 |  |  | 6,852 |
Other ABS | 127 |  |  | 439,883 |  |  | 2,228 |  |  | 5 |  |  | 4,649 |  |  | 40 |  |  | 132 |  |  | 444,532 |  |  | 2,268 |
Foreign government and agency securities | 19 |  |  | 20,800 |  |  | 273 |  |  | — |  |  | — |  |  | — |  |  | 19 |  |  | 20,800 |  |  | 273 |
Total | 612 |  |  | $ | 2,417,708 |  |  | $ | 46,167 |  |  | 68 |  |  | $ | 223,335 |  |  | $ | 11,699 |  |  | 680 |  |  | $ | 2,641,043 |  |  | $ | 57,866 |
| December 31, 2017
($ in thousands) Description of Securities | Less Than 12 Months |  | 12 Months or Greater |  | Total
# of securities |  | Fair Value |  | Unrealized Losses |  | # of securities |  | Fair Value |  | Unrealized Losses |  | # of securities |  | Fair Value |  | Unrealized Losses
U.S. government and agency securities | 6 |  |  | $ | 23,309 |  |  | $ | 129 |  |  | 3 |  |  | $ | 9,799 |  |  | $ | 238 |  |  | 9 |  |  | $ | 33,108 |  |  | $ | 367 |
State and municipal obligations | 21 |  |  | 65,898 |  |  | 699 |  |  | — |  |  | — |  |  | — |  |  | 21 |  |  | 65,898 |  |  | 699 |
Corporate bonds and notes | 152 |  |  | 672,318 |  |  | 4,601 |  |  | 32 |  |  | 139,105 |  |  | 3,451 |  |  | 184 |  |  | 811,423 |  |  | 8,052 |
RMBS | 8 |  |  | 19,943 |  |  | 204 |  |  | 26 |  |  | 101,812 |  |  | 2,658 |  |  | 34 |  |  | 121,755 |  |  | 2,862 |
CMBS | 35 |  |  | 139,353 |  |  | 1,395 |  |  | 4 |  |  | 3,518 |  |  | 215 |  |  | 39 |  |  | 142,871 |  |  | 1,610 |
Other ABS | 92 |  |  | 260,864 |  |  | 777 |  |  | 7 |  |  | 8,297 |  |  | 45 |  |  | 99 |  |  | 269,161 |  |  | 822 |
Foreign government and agency securities | 5 |  |  | 7,397 |  |  | 33 |  |  | — |  |  | — |  |  | — |  |  | 5 |  |  | 7,397 |  |  | 33 |
Equity securities | 13 |  |  | 149,785 |  |  | 1,989 |  |  | — |  |  | — |  |  | — |  |  | 13 |  |  | 149,785 |  |  | 1,989 |
Total | 332 |  |  | $ | 1,338,867 |  |  | $ | 9,827 |  |  | 72 |  |  | $ | 262,531 |  |  | $ | 6,607 |  |  | 404 |  |  | $ | 1,601,398 |  |  | $ | 16,434 |
Trading Securities (and Certain Trading Assets) [Table Text Block] | The trading securities within our investment portfolio, which are recorded at fair value, consisted of the following as of the dates indicated:
(In thousands) | March 31, 2018 |  | December 31, 2017
Trading securities: |  |  |
State and municipal obligations | $ | 203,188 |  |  | $ | 214,841 |
Corporate bonds and notes | 280,323 |  |  | 307,271 |
RMBS | 26,084 |  |  | 29,520 |
CMBS | 49,634 |  |  | 50,561 |
Foreign government and agency securities | 4,180 |  |  | 4,241 |
Total (1) | $ | 563,409 |  |  | $ | 606,434 |
______________________
(1) | Includes a de minimis amount of loaned securities under securities lending agreements that are classified as other assets in our consolidated balance sheets, as further described below.
Gain (Loss) on Investments [Table Text Block] | Net realized and unrealized gains (losses) on investments and other financial instruments consisted of:
| Three Months Ended March 31,
(In thousands) | 2018 |  | 2017
Net realized gains (losses): |  |  |
Fixed-maturities available for sale | $ | (3,120 | ) |  | $ | (2,509 | )
Equity securities | 142 |  |  | — |
Trading securities | (538 | ) |  | (5,694 | )
Short-term investments | — |  |  | 6 |
Other invested assets | 62 |  |  | — |
Other gains (losses) | 12 |  |  | 18 |
Net realized gains (losses) on investments | (3,442 | ) |  | (8,179 | )
Other-than-temporary impairment losses | (844 | ) |  | — |
Unrealized gains (losses) on investment securities (1) | (12,804 | ) |  | 5,226 |
Total net gains (losses) on investments | (17,090 | ) |  | (2,953 | )
Net gains (losses) on other financial instruments | (1,797 | ) |  | 102 |
Net gains (losses) on investments and other financial instruments | $ | (18,887 | ) |  | $ | (2,851 | )
______________________
(1) | These amounts include unrealized gains (losses) on investment securities other than securities available for sale. For the three months ended March 31, 2017, the amount excludes the net change in unrealized gains and losses on equity securities. Prior to the implementation of the update to the standard for the accounting of financial instruments effective January 1, 2018, the unrealized losses associated with equity securities were classified in accumulated other comprehensive income.
Investments Classified by Contractual Maturity Date [Table Text Block] | The contractual maturities of fixed-maturity investments available for sale were as follows:
| March 31, 2018
| Available for Sale
(In thousands) | Amortized Cost |  | Fair Value
Due in one year or less (1) | $ | 35,241 |  |  | $ | 35,146 |
Due after one year through five years (1) | 745,894 |  |  | 735,622 |
Due after five years through 10 years (1) | 1,016,043 |  |  | 989,756 |
Due after 10 years (1) | 368,170 |  |  | 375,974 |
RMBS (2) | 233,144 |  |  | 228,040 |
CMBS (2) | 476,601 |  |  | 470,834 |
Other ABS (2) | 736,967 |  |  | 736,518 |
Total (3) | $ | 3,612,060 |  |  | $ | 3,571,890 |
______________________
(1) | Actual maturities may differ as a result of calls before scheduled maturity.
(2) | RMBS, CMBS and Other ABS are shown separately, as they are not due at a single maturity date.
(3) | Includes securities loaned under securities lending agreements.

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- Definition Tabular disclosure of the realized and unrealized gains and losses reported in the statement of income which have resulted from the sale and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale or disposal of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such 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 (d) -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 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.M) -URI http://asc.fasb.org/extlink&oid=65877573&loc=d3e87990-122713 + Details
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