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Share Based Compensation - Summary of ESPP Annual Offerings (Details) - Employee Stock Purchase Plan - $ / shares shares in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common shares purchased (in shares) | 73 | 75 | 53
Per common share purchase price (in dollars per share) | $ 20.67 | $ 20.67 | $ 34.15

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