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Common Shares (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 21, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Common Shares |  |  |  |  |
Shares repurchased |  |  |  |  | 0.3
Repurchase of treasury shares |  |  |  |  | $ 1,687
Dividends paid |  |  |  | $ 34,307 | $ 33,925
Common shares |  |  |  |  |
Common stock dividend declared (in dollars per share) | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06
Cash dividends paid |  |  |  | $ 34,197 | $ 16,922

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