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Note 6 - Investments Total Debt and Equity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Securities Loaned, Asset $ 27,964  
Fixed maturities available for sale securities    
Fair value 3,649,447 $ 2,839,842
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 48,778 20,827
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 16,434 38,783
Amortized Cost Debt and Equity Securities 3,617,103 2,857,798
Debt Securities [Member]    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 3,440,754 2,856,468
Fair value 3,473,382 [1] 2,838,512
Gross unrealized gains 47,073 20,827
Gross unrealized losses 14,445 38,783
US government and agency securities    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 69,668 78,931
Fair value 69,396 75,474
Gross unrealized gains 96 2
Gross unrealized losses 367 3,459
State and municipal obligations    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 156,587 66,124
Fair value 161,722 67,171
Gross unrealized gains 5,834 1,868
Gross unrealized losses 699 821
Corporate bonds and notes    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 1,869,318 1,463,720
Fair value 1,894,886 1,455,628
Gross unrealized gains 33,620 14,320
Gross unrealized losses 8,052 22,412
RMBS    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 189,455 358,262
Fair value 187,229 350,628
Gross unrealized gains 636 197
Gross unrealized losses 2,862 7,831
CMBS    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 451,595 429,057
Fair value 453,394 428,289
Gross unrealized gains 3,409 2,255
Gross unrealized losses 1,610 3,023
Asset-backed Securities [Member]    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 672,715 433,603
Fair value 674,548 434,728
Gross unrealized gains 2,655 2,037
Gross unrealized losses 822 912
Foreign Government Debt Securities [Member]    
Fixed maturities available for sale securities    
Amortized cost - Debt Securities 31,416 24,771
Fair value 32,207 24,594
Gross unrealized gains 823 148
Gross unrealized losses 33 325
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 176,349 [2] 1,330 [3]
Equity securities available for sale—at fair value 176,065 [1],[2] 1,330 [3]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 1,705 [2] 0 [3]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax 1,989 [2] 0 [3]
2013 Freddie Mac Agreement [Member] | Radian Guaranty Inc [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Marketable Securities, Restricted 5,600 $ 63,900
Securities Financing Transaction, Fair Value [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Loaned, Asset [4] 27,964  
Securities Financing Transaction, Fair Value [Member] | Fixed Maturities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Loaned, Asset [4] 14,700  
Securities Financing Transaction, Fair Value [Member] | Corporate bonds and notes    
Schedule of Available-for-sale Securities [Line Items]    
Securities Loaned, Asset [4] 13,862  
Securities Financing Transaction, Fair Value [Member] | Foreign Government Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Securities Loaned, Asset [4] 867  
Securities Financing Transaction, Fair Value [Member] | Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Securities Loaned, Asset [4] $ 13,235  
[1] Includes $14.7 million and $13.2 million of fixed maturities and equity securities, respectively, of securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our 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.
[3] 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 FHLB.
[4] Our securities loaned under securities lending agreements are included at fair value within other assets on our consolidated balance sheets. All of our securities lending agreements are classified as overnight and revolving. None of the amounts are subject to offsetting.