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SHARE CAPITAL AND CAPITAL IN EXCESS OF PAR VALUE: (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | $ 691,136 |  |
Balance at the beginning of the period (in shares) | 78 |  |
Balance at the end of the period | $ 698,548 | $ 691,136 |
Balance at the end of the period (in shares) | 80 | 78 |
Total Number of Shares Purchased | 1,047 | 861 | 752
Average Price Paid Per Share (in dollars per share) | $ 31.47 | $ 29.02 | $ 30.73
Stock dividend rate (as a percent) | 3.00% | 3.00% | 3.00%
Common Stock |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | $ 25,892 | $ 25,702 | $ 25,450
Balance at the beginning of the period (in shares) | 37,285 | 37,011 | 36,649
Issuance of 3% stock dividend | $ 773 | $ 763 | $ 761
Issuance of 3% stock dividend (in shares) | 1,112 | 1,099 | 1,095
Conversion of Class B common shares to common shares | $ 22 | $ 25 | $ 13
Conversion of Class B common shares to common shares (in shares) | 32 | 36 | 19
Purchase and retirement of common shares | $ (727) | $ (598) | $ (522)
Purchase and retirement of common shares (in shares) | (1,047) | (861) | (752)
Balance at the end of the period | $ 25,960 | $ 25,892 | $ 25,702
Balance at the end of the period (in shares) | 37,382 | 37,285 | 37,011
Class B Common Stock |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | $ 15,894 | $ 15,455 | $ 15,018
Balance at the beginning of the period (in shares) | 22,887 | 22,256 | 21,627
Issuance of 3% stock dividend | $ 476 | $ 464 | $ 450
Issuance of 3% stock dividend (in shares) | 687 | 667 | 648
Conversion of Class B common shares to common shares | $ (22) | $ (25) | $ (13)
Conversion of Class B common shares to common shares (in shares) | (32) | (36) | (19)
Balance at the end of the period | $ 16,348 | $ 15,894 | $ 15,455
Balance at the end of the period (in shares) | 23,542 | 22,887 | 22,256
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) | 78 | 76 | 73
Issuance of 3% stock dividend (in shares) | 2 | 2 | 3
Balance at the end of the period | $ (1,992) | $ (1,992) | $ (1,992)
Balance at the end of the period (in shares) | 80 | 78 | 76
Capital in Excess of Par Value |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | $ 599,186 | $ 572,669 | $ 547,576
Issuance of 3% stock dividend | 55,982 | 50,939 | 47,714
Purchase and retirement of common shares | (32,286) | (24,422) | (22,621)
Balance at the end of the period | $ 622,882 | $ 599,186 | $ 572,669

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