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Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Organization and Summary of Significant Accounting Policies |
Summary of carrying values and fair values of senior subordinated notes and fixed rate mortgage facilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019 |
​ |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value |
3.50% senior subordinated notes due 2025 | ​ | ​ | 543.2 | ​ | ​ | 554.6 | ​ | ​ | — | ​ | ​ | — | ​
5.50% senior subordinated notes due 2026 | ​ | ​ | 496.4 | ​ | ​ | 515.0 | ​ | ​ | 495.7 | ​ | ​ | 521.7 | ​
Mortgage facilities | ​ |  | 458.1 | ​ |  | 474.7 | ​ |  | 423.2 | ​ |  | 430.9 | ​
Reconciliation of number of shares used in calculation of basic and diluted earning per share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
​ |  | 2020 |  | 2019 |  | 2018 |
​ | ​ | ​ | ​ | ​ | ​ | ​ |
Weighted average number of common shares outstanding |  | 80,594,856 |  | 82,495,045 |  | 85,165,367 | ​
Effect of non-participatory equity compensation |  | — |  | — |  | — | ​
Weighted average number of common shares outstanding, including effect of dilutive securities |  | 80,594,856 |  | 82,495,045 |  | 85,165,367 | ​

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