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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Numerator: |  |  |
Net income | $ 1,946,320 | $ 1,406,839 | $ 1,016,700
Less: earnings distributed to participating securities | (1,218) | (1,106) | (1,228)
Less: undistributed earnings allocated to participating securities | (15,117) | (11,348) | (9,143)
Numerator for basic earnings per share | 1,929,985 | 1,394,385 | 1,006,329
Add back: undistributed earnings allocated to participating securities | 15,117 | 11,348 | 9,143
Less: undistributed earnings reallocated to participating securities | (15,080) | (11,312) | (9,117)
Numerator for diluted earnings per share | $ 1,930,022 | $ 1,394,421 | $ 1,006,355

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