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Note 6 - Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 5,349,405		$ 5,393,623
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		(948)
Less: loaned securities	130,850		57,499
Fixed-maturity investments available for sale, Total, Fair Value	5,572,813		5,723,340
Fixed-maturities available for sale | U.S. government and agencies securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities	213,954		176,033
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,161		1,677
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(902)		(3,611)
Available-for-sale Securities, Debt Securities, Including Loaned Securities	214,213		174,099
Fixed-maturities available for sale | State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities	141,431		149,258
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	16,635		16,113
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(122)		(100)
Available-for-sale Securities, Debt Securities, Including Loaned Securities	157,944		165,271
Fixed-maturities available for sale | Corporate bonds and notes
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities	2,909,453		2,832,350
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	$ (638)	(948)	$ (2,476)	$ 0	$ 0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	175,493		250,771
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(19,486)		(3,758)
Available-for-sale Securities, Debt Securities, Including Loaned Securities	3,065,460		3,078,415
Fixed-maturities available for sale | RMBS
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities	701,664		799,814
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	21,478		34,439
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(3,302)		(314)
Available-for-sale Securities, Debt Securities, Including Loaned Securities	719,840		833,939
Fixed-maturities available for sale | CMBS
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities	685,595		645,071
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	31,437		39,495
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(2,361)		(3,301)
Available-for-sale Securities, Debt Securities, Including Loaned Securities	714,671		681,265
Fixed-maturities available for sale | CLO
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities	519,909		569,173
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,851		2,026
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(607)		(2,641)
Available-for-sale Securities, Debt Securities, Including Loaned Securities	521,153		568,558
Fixed-maturities available for sale | Other ABS
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities	225,012		249,988
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,190		2,901
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(234)		(432)
Available-for-sale Securities, Debt Securities, Including Loaned Securities	226,968		252,457
Fixed-maturities available for sale | Foreign government and agency securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities	5,105		5,100
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	294		338
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0		0
Available-for-sale Securities, Debt Securities, Including Loaned Securities	5,399		5,438
Fixed-maturities available for sale | Mortgage insurance-linked notes
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities	45,384
Debt Securities, Available-for-sale, Allowance for Credit Loss	0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	2,649
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0
Available-for-sale Securities, Debt Securities, Including Loaned Securities	48,033
Fixed-maturities available for sale | Total fixed-maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Including Loaned Securities	5,447,507		5,426,787
Debt Securities, Available-for-sale, Amortized Cost	5,349,405		5,393,623
Debt Securities, Available-for-sale, Allowance for Credit Loss	0		(948)
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	253,188		347,760
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(27,014)		(14,157)
Available-for-sale Securities, Debt Securities, Including Loaned Securities	5,673,681		5,759,442
Fixed-maturity investments available for sale, Total, Fair Value	5,572,813		5,723,340
Fixed-maturities available for sale | Securities Financing Transaction, Cost | Total fixed-maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Less: loaned securities	98,102		33,164
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value | Total fixed-maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Less: loaned securities	$ 100,868		$ 36,102

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