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Financial Statement Schedule I - BALANCE SHEETS Additional Information (Details) - $ / shares | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Condensed Financial Statements |  |
Common share, par value (in dollars per share) | $ 0 | $ 0
Common shares, shares issued (in shares) | 59,820,384 | 59,371,684
Common shares, shares outstanding (in shares) | 59,820,384 | 59,371,684
Parent Company |  |
Condensed Financial Statements |  |
Treasury Stock, Common, Shares |  | 609,516
Reportable Legal Entities [Member] | Parent Company |  |
Condensed Financial Statements |  |
Common share, par value (in dollars per share) | $ 0 |
Common shares, shares issued (in shares) | 59,820,384 | 59,371,684
Common shares, shares outstanding (in shares) | 59,820,384 | 59,371,684
Treasury Stock, Common, Shares | 0 |

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