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Capital Stock (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Summary of Common Share Activity

A summary of common share activity for the years ended December 31 follows (in shares):

						2020						2019						2018
Common shares outstanding at January 1						135,577,878						135,173,948						134,275,609
Shares repurchased						(1,240,328)						(106,388)						(92,167)
Shares issued upon exercise of employee stock options						—						70,000						—
Restricted stock issued to employees, net of forfeitures						439,700						416,695						958,672
Shares issued to non-employee directors						23,780						23,623						31,834
Common shares outstanding at December 31						134,801,030						135,577,878						135,173,948

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