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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
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period (in shares) | (71) |  |
Stock dividend rate (as a percent) | 3.00% | 3.00% | 3.00%
Balance at the end of the period (in shares) | (73) | (71) |
Total Number of Shares Purchased | 944 | 708 | 865
Average Price Paid Per Share (in dollars per share) | $ 25.16 | $ 25.64 | $ 26.41
Common Stock |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | $ 25,333 | $ 25,040 | $ 24,862
Balance at the beginning of the period (in shares) | 36,479 | 36,057 | 35,802
Issuance of 3% stock dividend | 753 | 748 | 743
Issuance of 3% stock dividend (in shares) | 1,085 | 1,077 | 1,070
Conversion of Class B common shares to common shares | 20 | 37 | 35
Conversion of Class B common shares to common shares (in shares) | 29 | 53 | 50
Purchase and retirement of common shares | (656) | (492) | (600)
Purchase and retirement of common shares (in shares) | (944) | (708) | (865)
Balance at the end of the period | 25,450 | 25,333 | 25,040
Balance at the end of the period (in shares) | 36,649 | 36,479 | 36,057
Class B Common Stock |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | 14,601 | 14,212 | 13,833
Balance at the beginning of the period (in shares) | 21,025 | 20,466 | 19,919
Issuance of 3% stock dividend | 437 | 426 | 414
Issuance of 3% stock dividend (in shares) | 631 | 612 | 597
Conversion of Class B common shares to common shares | (20) | (37) | (35)
Conversion of Class B common shares to common shares (in shares) | (29) | (53) | (50)
Balance at the end of the period | 15,018 | 14,601 | 14,212
Balance at the end of the period (in shares) | 21,627 | 21,025 | 20,466
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) | (71) | (69) | (67)
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) | (73) | (71) | (69)
Capital in Excess of Par Value |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | 533,677 | 505,495 | 482,250
Issuance of 3% stock dividend | 37,046 | 45,880 | 45,526
Purchase and retirement of common shares | (23,147) | (17,698) | (22,281)
Balance at the end of the period | $ 547,576 | $ 533,677 | $ 505,495

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