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Schedule II Financial Information of Registrant - Parent Company Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Assets |  |
Fixed-maturities available for sale—at fair value (amortized cost of $836,191 and $429,999) | $ 5,723,340 | $ 4,688,911
Trading securities—at fair value (amortized cost of $— and $—) | 290,885 | 317,150
Equity securities—at fair value (cost of $— and $13,280) | 151,240 | 130,221
Short-term investments—at fair value | 618,004 | 518,393
Other invested assets—at fair value | 4,973 | 4,072
Total investments | 6,788,442 | 5,658,747
Cash | 87,915 | 92,729
Investment in subsidiaries, at equity in net assets (Note C) | 4,100,000 |
Accounts and notes receivable | 121,294 | 93,630
Other assets (Note C) | 447,447 | 409,672
Total assets | 7,948,021 | 6,808,313
Liabilities and Stockholders’ Equity |  |
Senior notes | 1,405,674 | 887,110
Net deferred tax liability (Note A) | 213,897 | 71,084
Other liabilities | 291,855 | 343,105
Total liabilities | 3,663,668 | 2,759,590
Common stock: par value $0.001 per share; 485,000 shares authorized at December 31, 2020 and 2019; 210,130 and 219,123 shares issued at December 31, 2020 and 2019, respectively; 191,606 and 201,164 shares outstanding at December 31, 2020 and 2019, respectively | 210 | 219
Treasury stock, at cost: 18,524 and 17,959 shares at December 31, 2020 and 2019, respectively | (910,115) | (901,657)
Additional paid-in capital | 2,245,897 | 2,449,884
Retained earnings | 2,684,636 | 2,389,789
Accumulated other comprehensive income (loss) | 263,725 | 110,488
Total common stockholders’ equity | 4,284,353 | 4,048,723
Total liabilities and stockholders’ equity | 7,948,021 | 6,808,313
Balance Sheet Parentheticals [Abstract] |  |
Fixed-maturities available for sale—amortized cost | 5,393,623 | 4,549,534
Trading Securities, Amortized Cost | 260,773 | 297,505
Equity Securities, Amortized Cost | 145,501 | 125,311
Parent Company |  |
Assets |  |
Fixed-maturities available for sale—at fair value (amortized cost of $836,191 and $429,999) | 844,393 | 430,442
Equity securities—at fair value (cost of $— and $13,280) | 0 | 13,381
Short-term investments—at fair value | 233,569 | 162,363
Other invested assets—at fair value | 3,000 | 1,500
Total investments | 1,080,962 | 607,686
Cash | 20,141 | 23,534
Investment in subsidiaries, at equity in net assets (Note C) | 4,545,508 | 4,413,065
Accounts and notes receivable | 300,656 | 100,775
Other assets (Note C) | 75,305 | 113,917
Total assets | 6,022,572 | 5,258,977
Liabilities and Stockholders’ Equity |  |
Senior notes | 1,405,674 | 887,110
Net deferred tax liability (Note A) | 272,868 | 253,739
Other liabilities | 59,677 | 69,405
Total liabilities | 1,738,219 | 1,210,254
Common stock: par value $0.001 per share; 485,000 shares authorized at December 31, 2020 and 2019; 210,130 and 219,123 shares issued at December 31, 2020 and 2019, respectively; 191,606 and 201,164 shares outstanding at December 31, 2020 and 2019, respectively | 210 | 219
Treasury stock, at cost: 18,524 and 17,959 shares at December 31, 2020 and 2019, respectively | (910,115) | (901,657)
Additional paid-in capital | 2,245,897 | 2,449,884
Retained earnings | 2,684,636 | 2,389,789
Accumulated other comprehensive income (loss) | 263,725 | 110,488
Total common stockholders’ equity | 4,284,353 | 4,048,723
Total liabilities and stockholders’ equity | $ 6,022,572 | $ 5,258,977
Balance Sheet Parentheticals [Abstract] |  |
Common Stock, Par or Stated Value Per Share | $ 0.001 | $ 0.001
Common Stock, Shares Authorized | 485,000,000 | 485,000,000
Common Stock, Shares, Issued | 210,130,000 | 219,123,000
Common Stock, Shares, Outstanding | 191,606,000 | 201,164,000
Treasury Stock, Shares | 18,524,000 | 17,959,000
Fixed-maturities available for sale—amortized cost | $ 836,191 | $ 429,999
Equity Securities, Amortized Cost | $ 0 | $ 13,280

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