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Note 5 - Investments Available for Sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 76,600  
Loaned securities 34,364 $ 27,964
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   48,778
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   16,434
Available-for-sale Debt and Equity Securities, Amortized Cost   3,617,103
Available-for-sale Debt and Equity Securities, Fair Value   3,649,447
Fixed-maturities available for sale—at amortized cost 3,838,823 3,426,217
Fixed-maturities available for sale—at fair value (amortized cost $3,838,823 and $3,426,217) 3,763,710 3,458,719
US government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost   69,667
Available for Sale Securities, Fair Value   69,396
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   96
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   367
State and municipal obligations    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost   156,587
Available for Sale Securities, Fair Value   161,722
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   5,834
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   699
Corporate bonds and notes    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost   1,869,318
Available for Sale Securities, Fair Value   1,894,886
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   33,620
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   8,052
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost   189,455
Available for Sale Securities, Fair Value   187,229
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   636
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   2,862
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost   451,595
Available for Sale Securities, Fair Value   453,394
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   3,409
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   1,610
Other ABS    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost   672,715
Available for Sale Securities, Fair Value   674,548
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   2,655
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   822
Foreign government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost   31,417
Available for Sale Securities, Fair Value   32,207
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   823
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   33
Total fixed-maturities available for sale    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost   3,440,754
Available for Sale Securities, Fair Value [1]   3,473,382
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   47,073
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   14,445
Fixed-maturities available for sale—at amortized cost [2] 3,846,057  
Fixed-maturities available for sale—at fair value (amortized cost $3,838,823 and $3,426,217) [2] 3,770,742  
Equity securities available for sale    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Equity Securities, Amortized Cost [3]   176,349
Available-for-sale Equity Securities, Fair Value [1],[3]   176,065
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax [3]   1,705
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax [3]   1,989
Securities Financing Transaction, Fair Value    
Debt Securities, Available-for-sale [Line Items]    
Loaned securities [4] 34,364 27,964
Securities Financing Transaction, Fair Value | Corporate bonds and notes    
Debt Securities, Available-for-sale [Line Items]    
Loaned securities [4] 7,427 13,862
Securities Financing Transaction, Fair Value | Foreign government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Loaned securities [4] 0 867
Securities Financing Transaction, Fair Value | Equity securities available for sale    
Debt Securities, Available-for-sale [Line Items]    
Loaned securities [4] 26,847 13,235
Fixed maturities | US government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 10,500  
Available for Sale Securities, Amortized Cost 75,369  
Available for Sale Securities, Fair Value [5] 72,645  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 2,724  
Fixed maturities | State and municipal obligations    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost 140,877  
Available for Sale Securities, Fair Value 139,986  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1,859  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 2,750  
Fixed maturities | Corporate bonds and notes    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost 2,158,991  
Available for Sale Securities, Fair Value 2,108,779  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 4,262  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 54,474  
Fixed maturities | RMBS    
Debt Securities, Available-for-sale [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 66,100  
Available for Sale Securities, Amortized Cost 258,152  
Available for Sale Securities, Fair Value [6] 250,056  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 4  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 8,100  
Fixed maturities | CMBS    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost 536,982  
Available for Sale Securities, Fair Value 525,858  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 363  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 11,487  
Fixed maturities | Other ABS    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost 675,686  
Available for Sale Securities, Fair Value 673,418  
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 967  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 3,235  
Fixed maturities | Total fixed-maturities available for sale    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 7,455  
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 82,770  
Available-for-sale Debt and Equity Securities, Amortized Cost 3,846,057  
Available-for-sale Debt and Equity Securities, Fair Value [7] 3,770,742  
Fixed maturities | Securities Financing Transaction, Fair Value    
Debt Securities, Available-for-sale [Line Items]    
Loaned securities $ 7,000 $ 14,700
[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] Includes securities loaned under securities lending agreements.
[3] Primarily consists of investments in fixed-income and equity exchange-traded funds and publicly-traded business development company equities.
[4] 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.
[5] Includes securities with a fair value of $10.5 million serving as collateral for FHLB advances.
[6] Includes securities with a fair value of $66.1 million serving as collateral for FHLB advances.
[7] 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.