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Note 6 - Investments Contractual Maturities (Details) - USD ($)
$ in Thousands

Dec. 31, 2018

Dec. 31, 2017

Available-for-sale Securities, Amortized Cost

Fixed-maturities, Available-for-sale, Amortized Cost

$ 4,098,962

$ 3,426,217

Available-for-sale Securities, Fair Value

Fixed-maturities available for sale—at fair value

4,021,575

3,458,719

Debt Securities [Member]

Available-for-sale Securities, Amortized Cost

Fixed-maturities, Available-for-sale, Amortized Cost

3,440,754

Available-for-sale Securities, Fair Value

Fixed-maturities available for sale—at fair value

3,473,382

RMBS

Available-for-sale Securities, Amortized Cost

Fixed-maturities, Available-for-sale, Amortized Cost

189,455

Available-for-sale Securities, Fair Value

Fixed-maturities available for sale—at fair value

187,229

CMBS

Available-for-sale Securities, Amortized Cost

Fixed-maturities, Available-for-sale, Amortized Cost

451,595

Available-for-sale Securities, Fair Value

Fixed-maturities available for sale—at fair value

453,394

Other ABS

Available-for-sale Securities, Amortized Cost

Fixed-maturities, Available-for-sale, Amortized Cost

672,715

Available-for-sale Securities, Fair Value

Fixed-maturities available for sale—at fair value

$ 674,548

Fixed-maturities available for sale | Debt Securities [Member]

Available-for-sale Securities, Amortized Cost

Fixed-maturities, Available-for-sale, Amortized Cost

^[1]

4,106,594

Available-for-sale Securities, Fair Value

Fixed-maturities available for sale—at fair value

^[1]

4,028,987

Fixed-maturities available for sale | Non Asset Backed Security Investments, Contractual Maturities

Available-for-sale Securities, Amortized Cost

Due in one year or less

56,350

Due after one year through five years

^[2]

933,807

Due after five years through ten years

^[2]

1,142,145

Due after ten years

^[2]

379,972

Available-for-sale Securities, Fair Value

Due in one year or less

56,067

Due after one year through five years

^[2]

920,173

Due after five years through ten years

^[2]

1,107,129

Due after ten years

^[2]

368,899

Fixed-maturities available for sale | RMBS

Available-for-sale Securities, Amortized Cost

Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost

^[3]

334,843

Available-for-sale Securities, Fair Value

Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value

^[3]

332,142

Fixed-maturities available for sale | CMBS

Available-for-sale Securities, Amortized Cost

Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost

^[3]

546,729

Available-for-sale Securities, Fair Value

Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value

^[3]

539,915

Fixed-maturities available for sale | Other ABS

Available-for-sale Securities, Amortized Cost

Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost

^[3]

712,748

Available-for-sale Securities, Fair Value

Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value

^[3]

$ 704,662

[1]	Available for sale includes securities loaned under securities lending agreements with a fair value of $7.4 million.
[2]	Actual maturities may differ as a result of calls before scheduled maturity.
[3]	RMBS, CMBS, and Other ABS are shown separately, as they are not due at a single maturity date.

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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