Common Shares (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			3 Months Ended		9 Months Ended
	Oct. 03, 2017	Jul. 28, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Common Shares
Shares repurchased						0.3
Repurchase of treasury shares						$ 1,687
Dividends paid					$ 51,460	$ 50,926
Common shares
Common stock dividend declared (in dollars per share)		$ 0.06	$ 0.06	$ 0.06	$ 0.18	$ 0.18
Cash dividends paid	$ 17,200				$ 51,346	$ 33,927