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SHAREHOLDERS' EQUITY
 9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
SHAREHOLDERS' EQUITY
The following table presents changes in common shares issued and outstanding:
  Three months ended September 30,Nine months ended September 30,
  2021202020212020
Shares issued, balance at beginning of period176,580 176,580 176,580 176,580 
Shares issued— — — — 
Total shares issued at end of period176,580 176,580 176,580 176,580 
Treasury shares, balance at beginning of period(91,813)(92,274)(92,227)(92,621)
Shares repurchased(4)(2)(201)(155)
Shares reissued 10 5 621 505 
Total treasury shares at end of period(91,807)(92,271)(91,807)(92,271)
Total shares outstanding84,773 84,309 84,773 84,309 
Treasury Shares
The following table presents common shares repurchased from shares held in Treasury:
  Three months ended September 30,Nine months ended September 30,
  2021202020212020
In the open market:
Total shares— — — — 
Total cost$— $— $— $— 
Average price per share(1)
$— $— $— $— 
From employees:(2)
Total shares4 2 201 155 
Total cost$206 $84 $10,025 $8,685 
Average price per share(1)
$49.91 $46.85 $49.87 $55.94 
Total shares repurchased:
Total shares4 2 201 155 
Total cost$206 $84 $10,025 $8,685 
Average price per share(1)
$49.91 $46.85 $49.87 $55.94 
(1) Calculated using whole numbers.
(2)  Shares are repurchased from employees to satisfy withholding tax liabilities related to the vesting of share-settled restricted stock units.
Dividends
The following table presents dividends declared and paid related to the Company's common and preferred shares:
Per share data
Dividends declaredDividends paid in period of declarationDividends paid in period following declaration
Three months ended September 30, 2021
   Common shares$0.42 $— $0.42 
   Series E preferred shares$34.38 $— $34.38 
Three months ended September 30, 2020
   Common shares$0.41 $— $0.41 
   Series E preferred shares$34.38 $— $34.38 
Nine months ended September 30, 2021
   Common shares$1.26 $0.84 $0.42 
   Series E preferred shares
$103.13 $68.75 $34.38 
Nine months ended September 30, 2020
   Common shares$1.23 $0.82 $0.41 
   Series E preferred shares$103.13 $68.75 $34.38