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Unaudited Condensed Quarterly Financial Information | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Unaudited Condensed Quarterly Financial Information | Unaudited Condensed Quarterly Financial Information The following table summarizes the 2020 and 2019 unaudited condensed quarterly financial information:
| Fourth Quarter |  | Third Quarter |  | Second Quarter |  | First Quarter
Year Ended December 31, 2020 |  |  |  |  |  |  |
Net premiums written | $ | 1,758,015 |  |  | $ | 1,874,144 |  |  | $ | 1,668,311 |  |  | $ | 2,137,246 |
Net premiums earned | 1,811,045 |  |  | 1,771,092 |  |  | 1,665,354 |  |  | 1,744,444 |
Net investment income | 114,458 |  |  | 128,512 |  |  | 131,485 |  |  | 145,153 |
Net realized gains (losses) | 353,333 |  |  | 280,499 |  |  | 556,588 |  |  | (366,960) |
Underwriting income (loss) | 220,987 |  |  | 96,604 |  |  | (22,539) |  |  | 154,050 |
Net income (loss) attributable to Arch | 543,544 |  |  | 419,039 |  |  | 298,821 |  |  | 144,117 |
Preferred dividends | (10,403) |  |  | (10,403) |  |  | (10,403) |  |  | (10,403) |
Net income (loss) available to Arch common shareholders | 533,141 |  |  | 408,636 |  |  | 288,418 |  |  | 133,714 |
Net income (loss) per common share -- basic | $ | 1.32 |  |  | $ | 1.01 |  |  | $ | 0.72 |  |  | $ | 0.33 |
Net income (loss) per common share -- diluted | $ | 1.30 |  |  | $ | 1.00 |  |  | $ | 0.71 |  |  | $ | 0.32 |
Year Ended December 31, 2019 |  |  |  |  |  |  |
Net premiums written | $ | 1,455,453 |  |  | $ | 1,613,457 |  |  | $ | 1,444,898 |  |  | $ | 1,525,259 |
Net premiums earned | 1,515,882 |  |  | 1,438,023 |  |  | 1,463,727 |  |  | 1,368,866 |
Net investment income | 154,263 |  |  | 161,488 |  |  | 155,038 |  |  | 156,949 |
Net realized gains (losses) | 40,830 |  |  | 61,355 |  |  | 120,757 |  |  | 140,256 |
Underwriting income (loss) | 251,421 |  |  | 231,262 |  |  | 293,134 |  |  | 260,148 |
Net income (loss) attributable to Arch | 326,384 |  |  | 392,453 |  |  | 468,954 |  |  | 448,528 |
Preferred dividends | (10,403) |  |  | (10,403) |  |  | (10,403) |  |  | (10,403) |
Net income (loss) available to Arch common shareholders | 315,981 |  |  | 382,050 |  |  | 458,551 |  |  | 438,125 |
Net income (loss) per common share -- basic | $ | 0.78 |  |  | $ | 0.95 |  |  | $ | 1.14 |  |  | $ | 1.09 |
Net income (loss) per common share -- diluted | $ | 0.76 |  |  | $ | 0.92 |  |  | $ | 1.12 |  |  | $ | 1.07 |

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- References No definition available. + Details
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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