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Note 5 - Investments (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments [Abstract] |
Available for Sale Securities [Table Text Block] | Our available for sale securities within our investment portfolio consisted of the following as of the dates indicated:
| September 30, 2018
(In thousands) | Amortized Cost |  | Fair Value |  | Gross Unrealized Gains |  | Gross Unrealized Losses
Fixed-maturities available for sale: |  |  |  |  |  |  |
U.S. government and agency securities | $ | 75,369 |  |  | $ | 72,645 |  | (1) | $ | — |  |  | $ | 2,724 |
State and municipal obligations | 140,877 |  |  | 139,986 |  |  | 1,859 |  |  | 2,750 |
Corporate bonds and notes | 2,158,991 |  |  | 2,108,779 |  |  | 4,262 |  |  | 54,474 |
RMBS | 258,152 |  |  | 250,056 |  | (2) | 4 |  |  | 8,100 |
CMBS | 536,982 |  |  | 525,858 |  |  | 363 |  |  | 11,487 |
Other ABS | 675,686 |  |  | 673,418 |  |  | 967 |  |  | 3,235 |
Total securities available for sale | $ | 3,846,057 |  |  | $ | 3,770,742 |  | (3) | $ | 7,455 |  |  | $ | 82,770 |
______________________
(1) | Includes securities with a fair value of $10.5 million serving as collateral for FHLB advances.
(2) | Includes securities with a fair value of $66.1 million serving as collateral for FHLB advances.
(3) | Includes $7.0 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 available for sale | $ | 3,617,103 |  |  | $ | 3,649,447 |  |  | $ | 48,778 |  |  | $ | 16,434 |
______________________
(1) | Includes $14.7 million of fixed maturity securities and $13.2 million of equity securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our condensed consolidated balance sheets, as further described below.
(2) | Primarily consists of investments in fixed-income and equity exchange-traded funds and publicly-traded business development company equities.
For the nine months ended September 30, 2018, we did not transfer any securities from the available for sale or trading categories.
Gross Unrealized Losses and Fair Value of Available for Sale Securities [Table Text Block] | the following tables show the gross unrealized losses and fair values, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, as of the dates indicated. Included in the amounts as of September 30, 2018 and December 31, 2017 are loaned securities under securities lending agreements that are classified as other assets in our condensed consolidated balance sheets, as further described below.
|  | September 30, 2018
($ 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 |  | 9 |  |  | $ | 39,342 |  |  | $ | 1,944 |  |  | 5 |  |  | $ | 11,758 |  |  | $ | 780 |  |  | 14 |  |  | $ | 51,100 |  |  | $ | 2,724 |
State and municipal obligations |  | 25 |  |  | 76,914 |  |  | 2,166 |  |  | 6 |  |  | 13,172 |  |  | 584 |  |  | 31 |  |  | 90,086 |  |  | 2,750 |
Corporate bonds and notes |  | 383 |  |  | 1,619,774 |  |  | 43,840 |  |  | 35 |  |  | 157,323 |  |  | 10,634 |  |  | 418 |  |  | 1,777,097 |  |  | 54,474 |
RMBS |  | 23 |  |  | 169,259 |  |  | 3,271 |  |  | 28 |  |  | 80,158 |  |  | 4,829 |  |  | 51 |  |  | 249,417 |  |  | 8,100 |
CMBS |  | 78 |  |  | 423,684 |  |  | 10,098 |  |  | 11 |  |  | 26,830 |  |  | 1,389 |  |  | 89 |  |  | 450,514 |  |  | 11,487 |
Other ABS |  | 118 |  |  | 461,978 |  |  | 3,002 |  |  | 16 |  |  | 24,890 |  |  | 233 |  |  | 134 |  |  | 486,868 |  |  | 3,235 |
Total |  | 636 |  |  | $ | 2,790,951 |  |  | $ | 64,321 |  |  | 101 |  |  | $ | 314,131 |  |  | $ | 18,449 |  |  | 737 |  |  | $ | 3,105,082 |  |  | $ | 82,770 |
|  | 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 [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) | September 30, 2018 |  | December 31, 2017 |
Trading securities: |  |  |  |
State and municipal obligations | $ | 185,494 |  |  | $ | 214,841 |  |
Corporate bonds and notes | 235,422 |  |  | 307,271 |  |
RMBS | 22,069 |  |  | 29,520 |  |
CMBS | 50,971 |  |  | 50,561 |  |
Foreign government and agency securities | — |  |  | 4,241 |  |
Total | $ | 493,956 |  |  | $ | 606,434 |  | (1)
______________________ (1) At December 31, 2017, 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.
Securities Lending Agreements Balances [Table Text Block] | Key balances related to our securities lending agreements consisted of the following as of the dates indicated:
(In thousands) | September 30, 2018 |  | December 31, 2017
Loaned securities (1): |  |  |
U.S. government and agency securities | $ | 90 |  |  | $ | — |
Corporate bonds and notes | 7,427 |  |  | 13,862 |
Foreign government and agency securities | — |  |  | 867 |
Equity securities | 26,847 |  |  | 13,235 |
Total loaned securities, at fair value | $ | 34,364 |  |  | $ | 27,964 |
Total loaned securities, at amortized cost | $ | 34,651 |  |  | $ | 27,846 |
Securities collateral on deposit from Borrowers (2) | 3,367 |  |  | 9,342 |
Reinvested cash collateral, at estimated fair value (3) | 31,799 |  |  | 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.
Net Gains (Losses) on Investments and Other Financial Instruments [Table Text Block] | Net gains (losses) on investments and other financial instruments consisted of:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Net realized gains (losses): |  |  |  |  |  |  |
Fixed-maturities available for sale (1) | $ | (4,219 | ) |  | $ | 137 |  |  | $ | (9,030 | ) |  | $ | (3,552 | )
Equity securities | (69 | ) |  | 33 |  |  | 571 |  |  | 418 |
Trading securities | (260 | ) |  | (223 | ) |  | (910 | ) |  | (6,266 | )
Short-term investments | 7 |  |  | 14 |  |  | — |  |  | (18 | )
Other invested assets | 83 |  |  | — |  |  | 346 |  |  | — |
Other gains (losses) | 11 |  |  | 7 |  |  | 46 |  |  | 25 |
Net realized gains (losses) on investments | (4,447 | ) |  | (32 | ) |  | (8,977 | ) |  | (9,393 | )
Other-than-temporary impairment losses | (900 | ) |  | — |  |  | (1,744 | ) |  | (1,000 | )
Net unrealized gains (losses) on investment securities (2) | 1,405 |  |  | 2,353 |  |  | (17,132 | ) |  | 14,517 |
Total net gains (losses) on investments | (3,942 | ) |  | 2,321 |  |  | (27,853 | ) |  | 4,124 |
Net gains (losses) on other financial instruments | (538 | ) |  | 159 |  |  | (2,918 | ) |  | 836 |
Net gains (losses) on investments and other financial instruments | $ | (4,480 | ) |  | $ | 2,480 |  |  | $ | (30,771 | ) |  | $ | 4,960 |
______________________ (1)Components of net realized gains (losses) on fixed-maturities available for sale include:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Gross investment gains from sales and redemptions | $ | 814 |  |  | $ | 419 |  |  | $ | 1,831 |  |  | $ | 5,150 |
Gross investment losses from sales and redemptions | (5,033 | ) |  | (282 | ) |  | (10,861 | ) |  | (8,702 | )
(2) These amounts include unrealized gains (losses) on investment securities other than securities available for sale. For the three and nine months ended September 30, 2017, the unrealized gains (losses) on investments exclude 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 gains (losses) associated with equity securities were classified in accumulated other comprehensive income.
Net Unrealized Gains (Losses) on Investment Securities [Table Text Block] | The net changes in unrealized gains (losses) from trading securities and equity securities still held at period end were as follows for the periods indicated:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Net changes in unrealized gains (losses) (1): |  |  |  |  |  |  |
Equity securities | $ | 2,971 |  |  | $ | — |  |  | $ | 2,238 |  |  | $ | — |
Trading securities (2) | (2,622 | ) |  | 2,694 |  |  | (18,506 | ) |  | 10,011 |
Net changes in unrealized gains (losses) on investment securities | $ | 349 |  |  | $ | 2,694 |  |  | $ | (16,268 | ) |  | $ | 10,011 |
______________________
(1) | Related only to securities still held at period end. All amounts shown are included in net gains (losses) on investments and other financial instruments. 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.
(2) Includes a de minimis amount of net changes in unrealized gains (losses) related to short-term securities.
Contractual Maturities [Table Text Block] | The contractual maturities of fixed-maturity investments available for sale were as follows:
| September 30, 2018
| Available for Sale
(In thousands) | Amortized Cost |  | Fair Value
Due in one year or less (1) | $ | 51,228 |  |  | $ | 51,101 |
Due after one year through five years (1) | 823,314 |  |  | 809,555 |
Due after five years through 10 years (1) | 1,099,144 |  |  | 1,065,556 |
Due after 10 years (1) | 401,551 |  |  | 395,198 |
RMBS (2) | 258,152 |  |  | 250,056 |
CMBS (2) | 536,982 |  |  | 525,858 |
Other ABS (2) | 675,686 |  |  | 673,418 |
Total (3) | $ | 3,846,057 |  |  | $ | 3,770,742 |
______________________
(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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