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SHAREHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2020
Stockholders' Equity Note [Abstract]  
COMMON SHARES ISSUED AND OUTSTANDING
The following table presents changes in common shares issued and outstanding:
Year ended December 31,202020192018
Shares issued, balance at beginning of year176,580 176,580 176,580 
Shares issued— — — 
Total shares issued at end of year176,580 176,580 176,580 
Treasury shares, balance at beginning of year(92,621)(92,994)(93,419)
Shares repurchased(194)(176)(200)
Shares reissued 588 549 625 
Total treasury shares at end of year(92,227)(92,621)(92,994)
Total shares outstanding84,353 83,959 83,586 
SHARE REPURCHASES
The following table presents common shares repurchased from shares held in Treasury:
Year ended December 31,202020192018
In the open market:
Total shares— — — 
Total cost$— $— $— 
Average price per share (1)
$— $— $— 
From employees:(2)
Total shares194 176 200 
Total cost$10,382 $10,165 $10,080 
Average price per share(1)
$53.43 $57.66 $50.40 
Total shares repurchased:
Total shares194 176 200 
Total cost$10,382 $10,165 $10,080 
Average price per share(1)
$53.43 $57.66 $50.40 
(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.
SUMMARY OF DIVIDENDS DECLARED AND PAID
The following table presents dividends declared and paid related to the Company's common and preferred shares:
Per share data
Dividends declared Dividends paid in year of declarationDividends paid in year following declaration
Year ended December 31, 2018
  Common shares$1.57 $1.17 $0.40 
  Series D preferred shares$1.38 $1.03 $0.34 
  Series E preferred shares$137.50 $103.13 $34.38 
Year ended December 31, 2019
  Common shares$1.61 $1.20 $0.41 
  Series D preferred shares(1)
$1.21 $1.03 $0.18 
  Series E preferred shares$137.50 $103.13 $34.38 
Year ended December 31, 2020
  Common shares$1.65 $1.23 $0.42 
  Series E preferred shares$137.50 $103.13 $34.38 
(1) On January 17, 2020, the Company redeemed all 9,000,000 Series D preferred shares, for an aggregate liquidation preference of $225 million. The final dividend on the Series D preferred shares was declared in 2019.