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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period (in shares) | (73) |  |
Stock dividend rate (as a percent) | 3.00% | 3.00% | 3.00%
Balance at the end of the period (in shares) | (76) | (73) |
Total Number of Shares Purchased | 752 | 944 | 708
Average Price Paid Per Share (in dollars per share) | $ 30.73 | $ 25.16 | $ 25.64
Common Stock |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | $ 25,450 | $ 25,333 | $ 25,040
Balance at the beginning of the period (in shares) | 36,649 | 36,479 | 36,057
Issuance of 3% stock dividend | 761 | 753 | 748
Issuance of 3% stock dividend (in shares) | 1,095 | 1,085 | 1,077
Conversion of Class B common shares to common shares | 13 | 20 | 37
Conversion of Class B common shares to common shares (in shares) | 19 | 29 | 53
Purchase and retirement of common shares | (522) | (656) | (492)
Purchase and retirement of common shares (in shares) | (752) | (944) | (708)
Balance at the end of the period | 25,702 | 25,450 | 25,333
Balance at the end of the period (in shares) | 37,011 | 36,649 | 36,479
Class B Common Stock |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | 15,018 | 14,601 | 14,212
Balance at the beginning of the period (in shares) | 21,627 | 21,025 | 20,466
Issuance of 3% stock dividend | 450 | 437 | 426
Issuance of 3% stock dividend (in shares) | 648 | 631 | 612
Conversion of Class B common shares to common shares | (13) | (20) | (37)
Conversion of Class B common shares to common shares (in shares) | (19) | (29) | (53)
Balance at the end of the period | 15,455 | 15,018 | 14,601
Balance at the end of the period (in shares) | 22,256 | 21,627 | 21,025
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) | (73) | (71) | (69)
Issuance of 3% stock dividend (in shares) | (3) | (2) | (2)
Balance at the end of the period | (1,992) | (1,992) | (1,992)
Balance at the end of the period (in shares) | (76) | (73) | (71)
Capital in Excess of Par Value |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | 547,576 | 533,677 | 505,495
Issuance of 3% stock dividend | 47,714 | 37,046 | 45,880
Purchase and retirement of common shares | (22,621) | (23,147) | (17,698)
Balance at the end of the period | $ 572,669 | $ 547,576 | $ 533,677

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