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SHARE CAPITAL AND CAPITAL IN EXCESS OF PAR VALUE: (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period (in shares) | (69) |  |
Stock dividend rate (as a percent) | 3.00% | 3.00% | 3.00%
Balance at the end of the period (in shares) | (71) | (69) |
Total Number of Shares Purchased (in shares) | 708 | 865 | 938
Average Price Paid Per Share (in dollars per share) | $ 25.64 | $ 26.41 | $ 22.05
Common Stock |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | $ 25,040 | $ 24,862 | $ 24,762
Balance at the beginning of the period (in shares) | 36,057 | 35,802 | 35,658
Issuance of 3% stock dividend | 748 | 743 | 739
Issuance of 3% stock dividend (in shares) | 1,077 | 1,070 | 1,064
Conversion of Class B common shares to common shares | 37 | 35 | 12
Conversion of Class B common shares to common shares (in shares) | 53 | 50 | 18
Purchase and retirement of common shares | (492) | (600) | (651)
Purchase and retirement of common shares (in shares) | (708) | (865) | (938)
Balance at the end of the period | 25,333 | 25,040 | 24,862
Balance at the end of the period (in shares) | 36,479 | 36,057 | 35,802
Class B Common Stock |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | 14,212 | 13,833 | 13,442
Balance at the beginning of the period (in shares) | 20,466 | 19,919 | 19,357
Issuance of 3% stock dividend | 426 | 414 | 403
Issuance of 3% stock dividend (in shares) | 612 | 597 | 580
Conversion of Class B common shares to common shares | (37) | (35) | (12)
Conversion of Class B common shares to common shares (in shares) | (53) | (50) | (18)
Balance at the end of the period | 14,601 | 14,212 | 13,833
Balance at the end of the period (in shares) | 21,025 | 20,466 | 19,919
Treasury Stock |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | (1,992) | (1,992) | (1,992)
Balance at the beginning of the period (in shares) | (69) | (67) | (65)
Issuance of 3% stock dividend (in shares) | (2) | (2) | (2)
Balance at the end of the period | (1,992) | (1,992) | (1,992)
Balance at the end of the period (in shares) | (71) | (69) | (67)
Additional paid in capital |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | 505,495 | 482,250 | 470,927
Issuance of 3% stock dividend | 45,880 | 45,526 | 31,396
Purchase and retirement of common shares | (17,698) | (22,281) | (20,073)
Balance at the end of the period | $ 533,677 | $ 505,495 | $ 482,250

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