STOCK-BASED COMPENSATION - Three Year Vest Restricted Shares (Details) - USD ($) $ / shares in Units, $ in Millions							3 Months Ended	9 Months Ended
	Aug. 04, 2017	Jan. 25, 2017	Jan. 27, 2016	Feb. 09, 2015	Jan. 28, 2015	Jan. 22, 2014	Sep. 30, 2017	Sep. 30, 2017
Restricted Shares
Shares
Expired (in shares)							(32,000)
Three-Year Vesting | Restricted Shares
Stock-based compensation
Vesting per year (as a percent)		33.00%	33.00%			33.00%
Shares
Outstanding (in shares)								37,504
Granted (in shares)		17,451	21,100			14,500		17,451
Vested (in shares)								(17,298)
Forfeited (in shares)								(267)
Outstanding (in shares)							37,390	37,390
Weighted Average Fair Value
Outstanding (in dollars per share)								$ 47.53
Granted (in dollars per share								55.06
Vested (in dollars per share)								46.70
Forfeited (in dollars per share)								52.51
Outstanding (in dollars per share)							$ 51.39	$ 51.39
Compensation cost
Unrecognized compensation cost							$ 1.3	$ 1.3
Vesting period								3 years
Weighted average period of recognition of unrecognized compensation cost								1 year 9 months 18 days
Three-Year Vesting | Restricted Shares | Certain employees, excluding Mr. Albright
Stock-based compensation
Vesting per year (as a percent)					33.00%
Shares
Granted (in shares)					11,700
Three-Year Vesting | Restricted Shares | Mr. Albright
Stock-based compensation
Vesting per year (as a percent)				33.00%
Shares
Granted (in shares)				8,000
Equity Award Agreements | Three-Year Vesting
Award agreements
Period after change of control for equity award to fully vest upon termination of employment without cause or resignation	24 months