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Share Capital and Capital In Excess of Par Value (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Changes in share capital and capital in excess of par value |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | $ 750,497 |  |  |  |  |
Purchase and retirement of common shares and other |  |  | $ (27,232) | $ (16,650) |  |  |  |
Purchase and retirement of common shares and other (in shares) |  |  | (726,000) | (502,000) |  |  |  |
Balance at the end of the period | $ 758,140 | $ 746,736 | $ 758,140 | $ 746,736 |  |  |  |
Treasury stock, shares | 90,000 | 88,000 | 90,000 | 88,000 |  | 88,000 |  |
Stock dividends (as a percent) | 3.00% | 3.00% | 3.00% | 3.00% |  |  |  |
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) | $ (1,992) |  |  |  |
Issuance of 3% stock dividend (in shares) |  |  | 2,000 | 3,000 |  |  |  |
Balance at the end of the period | $ (1,992) | $ (1,992) | $ (1,992) | $ (1,992) |  |  |  |
Treasury stock, shares | 90,000 | 88,000 | 90,000 | 88,000 | 90,000 | 88,000 | 88,000 | 85,000
Capital in Excess of Par Value |  |  |  |  |  |  |  |
Changes in share capital and capital in excess of par value |  |  |  |  |  |  |  |
Balance at the beginning of the period | $ 710,703 | $ 699,965 | $ 696,535 | $ 656,752 |  |  |  |
Issuance of 3% stock dividend |  |  | 32,999 | 58,689 |  |  |  |
Purchase and retirement of common shares and other | (7,897) | (825) | (26,728) | (16,301) |  |  |  |
Balance at the end of the period | 702,806 | 699,140 | 702,806 | 699,140 |  |  |  |
Class B Common Stock | Common Stock. |  |  |  |  |  |  |  |
Changes in share capital and capital in excess of par value |  |  |  |  |  |  |  |
Balance at the beginning of the period | $ 18,264 | $ 17,781 | $ 17,767 | $ 17,285 |  |  |  |
Balance at the beginning of the period (in shares) | 26,302,000 | 25,605,000 | 25,584,000 | 24,891,000 |  |  |  |
Issuance of 3% stock dividend |  |  | $ 532 | $ 519 |  |  |  |
Issuance of 3% stock dividend (in shares) |  |  | 767,000 | 746,000 |  |  |  |
Conversion of Class B common shares to common shares |  | $ (5) | $ (35) | $ (27) |  |  |  |
Conversion of Class B common shares to common shares (in shares) | (2,000) | (6,000) | (51,000) | (38,000) |  |  |  |
Purchase and retirement of common shares and other |  | $ 1 |  |  |  |  |  |
Balance at the end of the period | $ 18,264 | $ 17,777 | $ 18,264 | $ 17,777 |  |  |  |
Balance at the end of the period (in shares) | 26,300,000 | 25,599,000 | 26,300,000 | 25,599,000 |  |  |  |
Common Stock | Common Stock. |  |  |  |  |  |  |  |
Changes in share capital and capital in excess of par value |  |  |  |  |  |  |  |
Balance at the beginning of the period | $ 27,245 | $ 26,837 | $ 26,767 | $ 26,361 |  |  |  |
Balance at the beginning of the period (in shares) | 39,233,000 | 38,645,000 | 38,544,000 | 37,960,000 |  |  |  |
Issuance of 3% stock dividend |  |  | $ 798 | $ 781 |  |  |  |
Issuance of 3% stock dividend (in shares) |  |  | 1,150,000 | 1,125,000 |  |  |  |
Conversion of Class B common shares to common shares |  | $ 5 | $ 35 | $ 27 |  |  |  |
Conversion of Class B common shares to common shares (in shares) | 2,000 | 6,000 | 51,000 | 38,000 |  |  |  |
Purchase and retirement of common shares and other | $ (149) | $ (22) | $ (504) | $ (349) |  |  |  |
Purchase and retirement of common shares and other (in shares) | (216,000) | (30,000) | (726,000) | (502,000) |  |  |  |
Balance at the end of the period | $ 27,096 | $ 26,820 | $ 27,096 | $ 26,820 |  |  |  |
Balance at the end of the period (in shares) | 39,019,000 | 38,621,000 | 39,019,000 | 38,621,000 |  |  |  |

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