Common Shares (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended
	Jul. 29, 2016	Mar. 31, 2017	Mar. 31, 2016
Common Shares
Shares repurchased		0.3
Repurchase of treasury shares			$ 1,687
Dividends paid		$ 17,153	$ 16,922
Common shares
Common stock dividend declared (in dollars per share)	$ 0.06	$ 0.06	$ 0.06
Cash dividends paid		$ 17,040	$ 16,922