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Note 6 - Investments Total Debt and Equity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fixed maturities available for sale securities    
Amortized cost - Debt Securities $ 2,856,468 $ 1,893,356
Fair value 2,839,842 1,940,891
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 20,827 6,297
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 38,783 34,300
Amortized Cost Debt and Equity Securities 2,857,798 1,968,894
Equity securities available for sale    
Available-for-sale Equity Securities, Amortized Cost Basis 1,330 75,538
Equity securities available for sale—at fair value 1,330 75,430
Debt Securities    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 2,856,468 1,893,356
Fair value 2,838,512 1,865,461
Gross unrealized gains 20,827 6,297
Gross unrealized losses 38,783 34,192
US government and agency securities    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 78,931 13,773
Fair value 75,474 13,752
Gross unrealized gains 2 0
Gross unrealized losses 3,459 21
US States and Political Subdivisions Debt Securities [Member]    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 66,124 36,920
Fair value 67,171 37,900
Gross unrealized gains 1,868 1,100
Gross unrealized losses 821 120
Corporate bonds and notes    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 1,463,720 815,024
Fair value 1,455,628 802,193
Gross unrealized gains 14,320 4,460
Gross unrealized losses 22,412 17,291
RMBS    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 358,262 226,744
Fair value 350,628 224,905
Gross unrealized gains 197 625
Gross unrealized losses 7,831 2,464
CMBS    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 429,057 415,780
Fair value 428,289 406,910
Gross unrealized gains 2,255 69
Gross unrealized losses 3,023 8,939
Asset-backed Securities [Member]    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 433,603 359,452
Fair value 434,728 355,494
Gross unrealized gains 2,037 16
Gross unrealized losses 912 3,974
Foreign government securities    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 24,771 25,663
Fair value 24,594 24,307
Gross unrealized gains 148 27
Gross unrealized losses 325 1,383
Other than Securities Investment [Member]    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 2,000  
Fair value 2,000  
Gross unrealized gains 0  
Gross unrealized losses 0  
Equity securities    
Equity securities available for sale    
Available-for-sale Equity Securities, Amortized Cost Basis 1,330 [1] 75,538 [2]
Equity securities available for sale—at fair value 1,330 [1] 75,430 [2]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 0 [1] 0 [2]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax $ 0 [1] $ 108 [2]
[1] Primarily consists of investments in Federal Home Loan Bank stock as required in connection with the memberships of Radian Guaranty and Radian Reinsurance in the Federal Home Loan Bank of Pittsburgh.
[2] Primarily consists of a multi-sector exchange-traded fund.