XML 62 R45.htm IDEA: XBRL DOCUMENT
v3.20.2

Note 4 - Fair Value of Financial Instruments Assets Measured at Fair Value by Hierarchy Level (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Other Investments |  | $ 4,047,000 |  | $ 4,047,000 |  | $ 4,072,000 |
Loaned securities |  | 16,332,000 |  | 16,332,000 |  | 66,442,000 |
Investments Measured at NAV |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Other Investments |  | 2,500,000 |  | 2,500,000 |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 6,427,303,000 | [1] | 6,427,303,000 | [1] | 5,654,675,000 | [2]
Assets, Fair Value Disclosure |  | 6,443,635,000 | [1] | 6,443,635,000 | [1] | 5,721,117,000 | [2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net |  | 0 |  | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net |  | 0 |  | 0 |  | 0 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 638,313,000 | [1] | 638,313,000 | [1] | 597,506,000 | [2]
Assets, Fair Value Disclosure |  | 652,526,000 | [1] | 652,526,000 | [1] | 660,279,000 | [2]
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 5,788,990,000 | [1] | 5,788,990,000 | [1] | 5,057,169,000 | [2]
Assets, Fair Value Disclosure |  | 5,791,109,000 | [1] | 5,791,109,000 | [1] | 5,060,838,000 | [2]
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Assets, Fair Value Disclosure |  | 7,600,000 |  | 7,600,000 |  | 400,000 |
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | US government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Loaned securities | [3] |  |  |  |  | 35,309,000 |
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Loaned securities |  | 2,119,000 | [4] | 2,119,000 | [4] | 3,669,000 | [3]
Securities Financing Transaction, Fair Value | Fair Value, Measurements, Recurring | Equity securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Loaned securities |  | 14,213,000 | [4] | 14,213,000 | [4] | 27,464,000 | [3]
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | US government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Loaned securities | [3] |  |  |  |  | 35,309,000 |
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Loaned securities |  | 0 | [4] | 0 | [4] | 0 | [3]
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Equity securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Loaned securities |  | 14,213,000 | [4] | 14,213,000 | [4] | 27,464,000 | [3]
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Loaned securities | [3] |  |  |  |  | 0 |
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Loaned securities |  | 2,119,000 | [4] | 2,119,000 | [4] | 3,669,000 | [3]
Securities Financing Transaction, Fair Value | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Equity securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Loaned securities |  | 0 | [4] | 0 | [4] | 0 | [3]
Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 5,070,091,000 |  | 5,070,091,000 |  | 4,688,911,000 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | US government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 133,043,000 |  | 133,043,000 |  | 179,584,000 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 123,117,000 |  | 123,117,000 |  | 119,994,000 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 2,648,456,000 |  | 2,648,456,000 |  | 2,237,611,000 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | RMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 835,769,000 |  | 835,769,000 |  | 779,354,000 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 637,491,000 |  | 637,491,000 |  | 608,015,000 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Other ABS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 686,875,000 |  | 686,875,000 |  | 759,129,000 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Foreign government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 5,340,000 |  | 5,340,000 |  | 5,224,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 124,600,000 |  | 124,600,000 |  | 143,884,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | US government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 124,600,000 |  | 124,600,000 |  | 143,884,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | RMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Other ABS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Foreign government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 4,945,491,000 |  | 4,945,491,000 |  | 4,545,027,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 8,443,000 |  | 8,443,000 |  | 35,700,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 123,117,000 |  | 123,117,000 |  | 119,994,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 2,648,456,000 |  | 2,648,456,000 |  | 2,237,611,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | RMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 835,769,000 |  | 835,769,000 |  | 779,354,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 637,491,000 |  | 637,491,000 |  | 608,015,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other ABS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 686,875,000 |  | 686,875,000 |  | 759,129,000 |
Fixed-maturities available for sale | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Foreign government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 5,340,000 |  | 5,340,000 |  | 5,224,000 |
Fixed-maturities available for sale | Securities Financing Transaction, Fair Value | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Loaned securities |  |  |  |  |  | 24,013,000 |
Trading Securities | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 297,609,000 |  | 297,609,000 |  | 317,150,000 |
Trading Securities | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 122,234,000 |  | 122,234,000 |  | 118,949,000 |
Trading Securities | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 126,000,000 |  | 126,000,000 |  | 147,232,000 |
Trading Securities | Fair Value, Measurements, Recurring | RMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 15,205,000 |  | 15,205,000 |  | 16,180,000 |
Trading Securities | Fair Value, Measurements, Recurring | CMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 34,170,000 |  | 34,170,000 |  | 34,789,000 |
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | RMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Trading Securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | CMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 297,609,000 |  | 297,609,000 |  | 317,150,000 |
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 122,234,000 |  | 122,234,000 |  | 118,949,000 |
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 126,000,000 |  | 126,000,000 |  | 147,232,000 |
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | RMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 15,205,000 |  | 15,205,000 |  | 16,180,000 |
Trading Securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | CMBS |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 34,170,000 |  | 34,170,000 |  | 34,789,000 |
Equity securities | Fair Value, Measurements, Recurring | Equity securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 104,513,000 |  | 104,513,000 |  | 130,221,000 |
Equity securities | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Equity securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 96,089,000 |  | 96,089,000 |  | 124,009,000 |
Equity securities | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Equity securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 8,424,000 |  | 8,424,000 |  | 6,212,000 |
Short-term investments | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 955,090,000 |  | 955,090,000 |  | 518,393,000 |
Short-term investments | Fair Value, Measurements, Recurring | US government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 42,528,000 |  | 42,528,000 |  | 127,152,000 |
Short-term investments | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 5,397,000 |  | 5,397,000 |  | 21,475,000 |
Short-term investments | Fair Value, Measurements, Recurring | Money market instruments |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 375,096,000 |  | 375,096,000 |  | 202,461,000 |
Short-term investments | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 149,490,000 |  | 149,490,000 |  | 20,298,000 |
Short-term investments | Fair Value, Measurements, Recurring | Other investments |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 382,579,000 | [5] | 382,579,000 | [5] | 147,007,000 | [6]
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 417,624,000 |  | 417,624,000 |  | 329,613,000 |
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | US government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 42,528,000 |  | 42,528,000 |  | 127,152,000 |
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Money market instruments |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 375,096,000 |  | 375,096,000 |  | 202,461,000 |
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Short-term investments | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Other investments |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 | [5] | 0 | [5] | 0 | [6]
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 537,466,000 |  | 537,466,000 |  | 188,780,000 |
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | US government and agency securities |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 5,397,000 |  | 5,397,000 |  | 21,475,000 |
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Money market instruments |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 0 |  | 0 |  | 0 |
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 149,490,000 |  | 149,490,000 |  | 20,298,000 |
Short-term investments | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Other investments |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Total Investments at Fair Value |  | 382,579,000 | [5] | 382,579,000 | [5] | 147,007,000 | [6]
Partnership investment |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Other Investments |  |  |  |  |  | 2,600,000 |
Convertible promissory note |  |  |  |  |  |  |
Fair Value by Hierarchy Level [Line Items] |  |  |  |  |  |  |
Other Investments |  | $ 1,500,000 |  | $ 1,500,000 |  | $ 1,500,000 |
[1] | Does not include other invested assets of $2.5 million that are primarily invested in limited partnership investments valued using the net asset value as a practical expedient and $1.5 million invested in a private convertible promissory note.
[2] | Does not include other invested assets of $2.6 million that are primarily invested in limited partnership investments valued using the net asset value as a practical expedient and $1.5 million invested in a private convertible promissory note.
[3] | Securities loaned to third-party borrowers under securities lending agreements are classified as other assets in our condensed consolidated balance sheets. See Note 5 for more information.
[4] | Securities loaned to third-party borrowers under securities lending agreements are classified as other assets in our condensed consolidated balance sheets. See Note 5 for more information.
[5] | Comprising short-term certificates of deposit and commercial paper.
[6] | Comprising short-term certificates of deposit and commercial paper.

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investments classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of asset associated with securities loaned to entities in exchange for collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_SecuritiesLoanedAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=rdn_InvestmentsMeasuredatNAVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=us-gaap_SecuritiesFinancingTransactionFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_FixedMaturitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rdn_TradingSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_OtherInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=srt_PartnershipInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rdn_ConvertiblePromissoryNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |