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Note 1 - Condensed Consolidated Financial Statements - Business Overview and Significant Accounting Policies Business Overview (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) segment | Jun. 30, 2019 USD ($) | May 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Business Overview [Abstract] |  |  |  |  |  |
Number of Reportable Business Segments | segment |  |  | 2 |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |
Net income (loss) | $ (29,951) | $ 166,730 | $ 110,510 | $ 337,687 |  |
Provision for losses | $ 304,418 | $ 47,427 | $ 340,369 | $ 68,181 |  |
Senior Notes Due 2025 | Senior Notes |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 525,000 |
Mortgage segment |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |
Private Mortgage Insurance Protects Lenders For Loans Made With Less Than This Maximum Down Payment Percentage | 20.00% |  | 20.00% |  |  |
Private Mortgage Insurance Protects Lenders For Refinancings Made to Home Buyers With Less Than This Maximum Equity-Ownership Percentage | 20.00% |  | 20.00% |  |  |
Direct Primary Mortgage Insurance in Force | $ 241,300,000 |  | $ 241,300,000 |  |  |
Direct Primary Mortgage Insurance RIF | 60,300,000 |  | 60,300,000 |  |  |
Credit Risk Transfer Transactions | Mortgage segment |  |  |  |  |  |
Mortgage Insurance [Abstract] |  |  |  |  |  |
Direct Primary Mortgage Insurance RIF | $ 325,100 |  | $ 325,100 |  |  | $ 275,200

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- Definition This element represents the maximum down payment percentage on a home's purchase price that is used to measure the need for private mortgage insurance. + References No definition available. + Details
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