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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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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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