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Schedule II - Condensed Financial Information of Parent Company - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Net income | $ 197,070 | $ 117,573 | $ 79,201
Stock-based compensation expense | 21,013 | 16,685 | 14,913
Net realized and unrealized (gains) losses on investments | (11,831) | (4,568) | (2,941)
Amortization of premium on fixed maturity securities | (61) | (945) | (9)
Deferred income tax expense (benefit) | 2,042 | 2,063 | (2,826)
Net cash provided by operating activities | 409,121 | 261,157 | 116,106
Purchases of equity securities | (55,550) | (202) | (945)
Purchases of fixed maturity securities | (848,358) | (601,410) | (233,770)
Sales and maturities of fixed maturity securities | 614,616 | 301,847 | 120,285
Net cash used in investing activities | (353,982) | (306,244) | (128,478)
Proceeds from stock offering, net of offering costs | (141) | 115,724 | 0
Proceeds from common stock issued via equity incentive plans | 1,165 | 902 | 799
Policy holder contribution to surplus | 3,719 | 2,758 | 90
Repurchase of common stock | (37,284) | 0 | (22,266)
Net cash provided by (used in) financing activities | (28,786) | 73,774 | (3,940)
Net increase (decrease) in cash, cash equivalents and restricted cash | 26,353 | 28,687 | (16,312)
Cash paid for federal income taxes | 57,961 | 37,810 | 20,640
Cash paid for state income taxes | 1,124 | 644 |
Cash paid for income taxes | 59,085 | 38,454 |
Cash paid for interest | 287 | 1,048 | 3,682
Parent Company [Member] |  |  |
Net income | 197,070 | 117,573 | 79,201
Equity in undistributed earnings of subsidiaries | (237,686) | (150,725) | (109,105)
Stock-based compensation expense | 10,543 | 10,513 | 10,426
Net realized and unrealized (gains) losses on investments | (3,514) | (23) | 209
Amortization of premium on fixed maturity securities | 18 | 172 | 189
Deferred income tax expense (benefit) | 1,874 | (15,640) | 2,787
Dividend received from subsidiary | 99,000 | 95,000 | 0
Changes in operating assets and liabilities: | (28,890) | (80,154) | 37,777
Net cash provided by operating activities | 38,415 | (23,284) | 21,484
Purchases of equity securities | (2,000) |  |
Purchases of fixed maturity securities | (34,753) | (114,611) | (11,045)
Sales and maturities of fixed maturity securities | 27,124 | 13,004 | 9,232
Cash paid to subsidiaries | (109,150) |  |
Cash received from subsidiaries | 109,489 |  |
Net cash used in investing activities | (9,290) | (101,607) | (1,813)
Proceeds from stock offering, net of offering costs | (141) | 115,724 | 0
Proceeds from common stock issued via equity incentive plans | 4,920 | 7,892 | 2,038
Policy holder contribution to surplus | 3,719 | 2,758 | 90
Repurchase of common stock | (37,284) | 0 | (22,266)
Net cash provided by (used in) financing activities | (28,786) | 126,374 | (20,138)
Net increase (decrease) in cash, cash equivalents and restricted cash | 339 | 1,483 | (467)
Cash and cash equivalents at beginning of period | 1,797 | 314 | 781
Cash and cash equivalents at end of period | 2,136 | 1,797 | 314
Cash paid for federal income taxes | 57,961 | 37,810 | 20,640
Cash paid for state income taxes | 1,124 | 644 | 484
Cash paid for interest | $ 287 | $ 1,048 | $ 3,682

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