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Capital Stock (Tables)
12 Months Ended
Dec. 31, 2022
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]  
Common Shares Outstanding and Treasury Shares Held Rollforward Table
Common Shares OutstandingYear Ended December 31,
 202220212020
At beginning of period126,937,163 125,976,071 125,481,163 
Exercise of common stock options, net80,409 10,929 — 
Grants of restricted stock, net (1)
1,644,728 950,163 494,908 
At end of period128,662,300 126,937,163 125,976,071 
(1)Prior to 2019, we primarily granted restricted stock awards, which immediately impacted common shares outstanding. In contrast, during 2022, 2021 and 2020, we primarily granted restricted stock units which do not impact common shares outstanding until vesting. Vesting for restricted stock units began in 2020.
Treasury Shares HeldYear Ended December 31,
 202220212020
At beginning of period3,138,675 2,953,976 2,823,191 
Shares received upon vesting of restricted stock, net— 184,699 130,785 
At end of period3,138,675 3,138,675 2,953,976