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Schedule II Condensed Financial Information of Registrant - Condensed Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
ASSETS |  |  |
Investment in subsidiaries | $ 448,996 | $ 383,717 |
Other assets | 443,165 | 474,364 |
Total assets | 13,471,813 | 12,478,704 | $ 11,031,896
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Short-term debt | 135,000 | 135,000 |
Long-term debt | 302,323 | 298,025 |
Other liabilities | 453,126 | 384,173 |
Total liabilities | 11,681,734 | 10,911,419 |
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued | 0 | 0 |
Common stock, $0.001 par value, authorized 75,000,000 shares; issued, 2020, 66,316,797; 2019, 66,088,808 | 66 | 66 |
Additional paid-in capital | 488,367 | 480,962 |
Retained earnings | 1,434,634 | 1,352,539 |
Accumulated other comprehensive income (loss), net of taxes: |  |  |
Net unrealized investment gains on fixed maturity securities | 366,285 | 230,448 |
Net funded status of benefit plans | (11,165) | (10,767) |
Treasury stock, at cost, 2020, 24,902,579 shares; 2019, 24,850,484 shares | (488,108) | (485,963) |
Total shareholders' equity | 1,790,079 | 1,567,285 | $ 1,290,550
Total liabilities and shareholders' equity | 13,471,813 | 12,478,704 |
Parent company |  |  |
ASSETS |  |  |
Investments and cash | 4,146 | 1,453 |
Investment in subsidiaries | 2,120,982 | 1,901,725 |
Other assets | 58,852 | 62,442 |
Total assets | 2,183,980 | 1,965,620 |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Short-term debt | 135,000 | 135,000 |
Long-term debt | 248,323 | 248,025 |
Other liabilities | 10,578 | 15,310 |
Total liabilities | 393,901 | 398,335 |
Preferred stock, $0.001 par value, authorized 1,000,000 shares; none issued | 0 | 0 |
Common stock, $0.001 par value, authorized 75,000,000 shares; issued, 2020, 66,316,797; 2019, 66,088,808 | 66 | 66 |
Additional paid-in capital | 488,367 | 480,962 |
Retained earnings | 1,434,634 | 1,352,539 |
Accumulated other comprehensive income (loss), net of taxes: |  |  |
Net unrealized investment gains on fixed maturity securities | 366,285 | 230,448 |
Net funded status of benefit plans | (11,165) | (10,767) |
Treasury stock, at cost, 2020, 24,902,579 shares; 2019, 24,850,484 shares | (488,108) | (485,963) |
Total shareholders' equity | 1,790,079 | 1,567,285 |
Total liabilities and shareholders' equity | $ 2,183,980 | $ 1,965,620 |

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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 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 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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