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Segment Reporting
 3 Months Ended
Mar. 31, 2026
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting
We operate as a single reportable segment, which is defined as Mortgage Insurance. This segment generates revenue by providing mortgage insurance to mortgage lending institutions and mortgage credit investors and by providing reinsurance under the GSEs credit risk transfer programs. The results of our Mortgage Insurance segment are reported within our financial statements as the consolidated financial results for MGIC Investment Corporation and subsidiaries. The accounting policies of the Mortgage Insurance segment are the same as those described in Note 2 - “Significant Accounting Policies” to the consolidated financial statements in our 2025 Annual Report on Form 10-K.

The Senior Management Oversight Committee (“SMOC”), acts as the Company's chief operating decision maker (“CODM”). The CODM uses consolidated net income (loss) as the primary GAAP measure to evaluate actual financial performance versus planned financial performance and to allocate resources. The measure of segment assets is reported on the balance sheet as total consolidated assets.

The table below presents a disaggregation of significant segment expenses as monitored by our CODM:
Significant Segment Expenses
Table14.1
Three Months Ended March 31,
(In thousands)
20262025
Other underwriting and operating expenses net:
Employee costs
$36,432 $36,960 
Outside services (1)
6,420 7,811 
Premium taxes (2)
5,503 5,410 
Depreciation expense
691 943 
All other underwriting and operating (3)
(2,162)282 
Total other underwriting and operating expenses net
$46,884 $51,406 
(1)Outside services expense generally includes expenses related to outsourced IT services and consulting services.
(2)Premium taxes are taxes paid to states and municipalities based upon the amount of premiums written.
(3)All other underwriting and operating expenses include ceding commissions (a reduction to our underwriting expenses, see Note 7 - "Reinsurance"), computer hardware and software expenses, legal, audit, insurance, and general and administrative expenses.