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Capital stock
9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Capital stock Capital stock
Share repurchases
 The Board of Directors of the Company (the “Board”) has authorized repurchases of up to $1,750,000 under the Company’s existing share repurchase program. The Company’s share repurchase program does not obligate it to acquire any specific number of shares. Under the program, shares may be purchased in privately negotiated and/or open market transactions, including under plans complying with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.
 
During the nine months ended September 30, 2020 and 2021, the Company repurchased 1,781,978 and 3,592,409 of its common shares, respectively, on the open market at a weighted average price of $41.28 and $40.96 per share, respectively, for an aggregate cash amount of $73,552 and $147,152, respectively. All repurchased shares have been retired. 
 
The Company records repurchases of its common shares on the settlement date of each transaction. Shares purchased and retired are deducted to the extent of their par value from common stock and from retained earnings for the excess over par value. Direct costs incurred to acquire the shares are included in the total cost of the shares purchased. For the nine months ended September 30, 2020 and 2021, retained earnings were reduced by the direct costs related to share repurchases of $36 and $72, respectively.
 
$489,846 remained available for share repurchases under the Company’s existing share repurchase program as of September 30, 2021. This repurchase program does not obligate the Company to acquire any specific number of shares and does not specify an expiration date. 
 Dividend
On February 6, 2020, the Company announced that its Board had approved a 15% increase in its quarterly cash dividend to $0.0975 per share, up from $0.085 per share in 2019, representing an annual dividend of $0.39 per common share, up from $0.34 per share in 2019, payable to holders of the Company’s common shares. On March 18, 2020, June 26, 2020 and September 23, 2020, the Company paid a dividend of $0.0975 per share, amounting to $18,543, $18,595 and $18,637 in the aggregate, to shareholders of record as of March 9, 2020, June 11, 2020 and September 11, 2020 respectively.
17. Capital stock (Continued)On February 9, 2021, the Company announced that its Board had approved a 10% increase in its quarterly cash dividend to $0.1075 per share, up from $0.0975 per share in 2020, representing a planned annual dividend of $0.43 per common share, up from $0.39 per share in 2020, payable to holders of the Company’s common shares. On March 19, 2021, June 23, 2021 and September 24, 2021, the Company paid a dividend of $0.1075 per share, amounting to $20,115, $20,133 and $20,213 in the aggregate, to shareholders of record as of March 10, 2021, June 11, 2021 and September 10, 2021, respectively