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SHARE CAPITAL AND CAPITAL IN EXCESS OF PAR VALUE: (Tables) | 12 Months Ended
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Dec. 31, 2012
SHARE CAPITAL AND CAPITAL IN EXCESS OF PAR VALUE: |
Schedule of changes in share capital and capital in excess of par value |
|  | Common Stock |  | Class B Common Stock |  | Treasury Stock |  | Capital in Excess of Par |
|  | Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount |  | Value |
|  | (000’s) |  |  |  | (000’s) |  |  |  | (000’s) |  |  |  |  |
Balance at January 1, 2010 |  | 35,802 |  | $ | 24,862 |  | 19,919 |  | $ | 13,833 |  | (67 | ) | $ | (1,992 | ) | $ | 482,250 |
Issuance of 3% stock dividend |  | 1,070 |  | 743 |  | 597 |  | 414 |  | (2 | ) | — |  | 45,526 |
Conversion of Class B common shares to common shares |  | 50 |  | 35 |  | (50 | ) | (35 | ) | — |  | — |  | — |
Purchase and retirement of common shares |  | (865 | ) | (600 | ) | — |  | — |  | — |  | — |  | (22,281 | )
Balance at December 31, 2010 |  | 36,057 |  | 25,040 |  | 20,466 |  | 14,212 |  | (69 | ) | (1,992 | ) | 505,495 |
Issuance of 3% stock dividend |  | 1,077 |  | 748 |  | 612 |  | 426 |  | (2 | ) | — |  | 45,880 |
Conversion of Class B common shares to common shares |  | 53 |  | 37 |  | (53 | ) | (37 | ) | — |  | — |  | — |
Purchase and retirement of common shares |  | (708 | ) | (492 | ) | — |  | — |  | — |  | — |  | (17,698 | )
|  | Common Stock |  | Class B Common Stock |  | Treasury Stock |  | Capital in Excess of Par |
|  | Shares |  | Amount |  | Shares |  | Amount |  | Shares |  | Amount |  | Value |
|  | (000’s) |  |  |  | (000’s) |  |  |  | (000’s) |  |  |  |  |
Balance at December 31, 2011 |  | 36,479 |  | $ | 25,333 |  | 21,025 |  | $ | 14,601 |  | (71 | ) | $ | (1,992 | ) | $ | 533,677 |
Issuance of 3% stock dividend |  | 1,085 |  | 753 |  | 631 |  | 437 |  | (2 | ) | — |  | 37,046 |
Conversion of Class B common shares to common shares |  | 29 |  | 20 |  | (29 | ) | (20 | ) | — |  | — |  | — |
Purchase and retirement of common shares |  | (944 | ) | (656 | ) | — |  | — |  | — |  | — |  | (23,147 | )
Balance at December 31, 2012 |  | 36,649 |  | $ | 25,450 |  | 21,627 |  | $ | 15,018 |  | (73 | ) | $ | (1,992 | ) | $ | 547,576 |
Schedule of shares purchased and retired |
Year |  | Total Number of Shares Purchased (000’s) |  | Average Price Paid Per Share |
2012 |  | 944 |  | $ | 25.16 |
2011 |  | 708 |  | $ | 25.64 |
2010 |  | 865 |  | $ | 26.41 |

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- Definition Tabular disclosure of shares repurchased and retired during the period. + References No definition available. + Details
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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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