SUMMARY OF STOCK AWARDS UNDER THE 2015 STOCK PLAN (Details) - 2015 Stock Plan - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Time Vesting Restricted Stock Awards
Restricted Stock
Balance at beginning of the period (in shares)	122,681
Granted (in shares)	141,701
Vested (in shares)	(55,448)
Forfeited (in shares)	(14,663)
Balance at end of the period (in shares)	194,271	122,681
Weighted Average Grant-Date Fair Value
Balance at beginning of the period (in usd per share)	$ 38.04
Granted (in dollars per share)	47.85	$ 43.38	$ 50.39
Vested (in dollars per share)	35.22
Forfeited (in dollars per share)	38.64
Balance at end of the period (in usd per share)	$ 45.95	$ 38.04
Performance Vesting Restricted Stock Awards
Restricted Stock
Balance at beginning of the period (in shares)	41,656
Granted (in shares)	106,314
Vested (in shares)	0
Forfeited (in shares)	(7,054)
Balance at end of the period (in shares)	140,916	41,656
Weighted Average Grant-Date Fair Value
Balance at beginning of the period (in usd per share)	$ 44.64
Granted (in dollars per share)	49.00	$ 44.62	$ 45.76
Vested (in dollars per share)	0.00
Forfeited (in dollars per share)	46.02
Balance at end of the period (in usd per share)	$ 47.86	$ 44.64