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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
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | $ 698,548 |  |
Balance at the beginning of the period (in shares) | 80 |  |
Balance at the end of the period | $ 711,538 | $ 698,548 |
Balance at the end of the period (in shares) | 83 | 80 |
Total Number of Shares Purchased | 818 | 1,047 | 861
Average Price Paid Per Share (in dollars per share) | $ 35.51 | $ 31.47 | $ 29.02
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 | $ 25,960 | $ 25,892 | $ 25,702
Balance at the beginning of the period (in shares) | 37,382 | 37,285 | 37,011
Issuance of 3% stock dividend | $ 772 | $ 773 | $ 763
Issuance of 3% stock dividend (in shares) | 1,111 | 1,112 | 1,099
Conversion of Class B common shares to common shares | $ 18 | $ 22 | $ 25
Conversion of Class B common shares to common shares (in shares) | 26 | 32 | 36
Purchase and retirement of common shares | $ (569) | $ (727) | $ (598)
Purchase and retirement of common shares (in shares) | (818) | (1,047) | (861)
Balance at the end of the period | $ 26,181 | $ 25,960 | $ 25,892
Balance at the end of the period (in shares) | 37,701 | 37,382 | 37,285
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) | 80 | 78 | 76
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) | 83 | 80 | 78
Capital in Excess of Par Value |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | $ 622,882 | $ 599,186 | $ 572,669
Issuance of 3% stock dividend | 52,410 | 55,982 | 50,939
Purchase and retirement of common shares | (28,524) | (32,286) | (24,422)
Balance at the end of the period | 646,768 | 622,882 | 599,186
Class B Common Stock | Common Stock. |  |  |
Changes in share capital and capital in excess of par value |  |  |
Balance at the beginning of the period | $ 16,348 | $ 15,894 | $ 15,455
Balance at the beginning of the period (in shares) | 23,542 | 22,887 | 22,256
Issuance of 3% stock dividend | $ 490 | $ 476 | $ 464
Issuance of 3% stock dividend (in shares) | 705 | 687 | 667
Conversion of Class B common shares to common shares | $ (18) | $ (22) | $ (25)
Conversion of Class B common shares to common shares (in shares) | (26) | (32) | (36)
Balance at the end of the period | $ 16,820 | $ 16,348 | $ 15,894
Balance at the end of the period (in shares) | 24,221 | 23,542 | 22,887

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