Dividend (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Feb. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Common stock dividend
Dividend declared (in dollars per share)	$ 0.22	$ 0.22	$ 0.22
Dividend paid (in dollars per share)		$ 0.22
Dividend paid (in dollars)		$ 2,754	$ 2,752
Dividend deferred in accordance with Deferred Compensation Plan		$ 4