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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table illustrates the earnings allocation method utilized in the calculation of basic and diluted earnings per share.
|  | Years Ended December 31,
(in thousands, except per-share amounts) |  | 2020 |  | 2019 |  | 2018
Earnings per share numerator: |  |  |  |  |  |
Net income attributable to common shareholders before allocation of earnings to participating securities |  | $ | 270,568 |  |  | $ | 254,286 |  |  | $ | 234,734 |
Earnings allocated to participating securities |  | 448 |  |  | 441 |  |  | 474 |
Net income attributable to common shareholders after allocation of earnings to participating securities |  | $ | 270,120 |  |  | $ | 253,845 |  |  | $ | 234,260 |
Earnings per share denominator: |  |  |  |  |  |
Weighted-average number of shares of common stock outstanding - basic and diluted |  | 10,961 |  |  | 11,166 |  |  | 11,515 |
Earnings per share - basic and diluted |  | $ | 24.64 |  |  | $ | 22.73 |  |  | $ | 20.34 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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