STOCK OWNERSHIP AND BENEFIT PLANS - Activity of Nonvested Shares of Restricted Stock and Restricted Stock Units (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted stock [Member]
Shares
Balance at the beginning of the period (in shares)	262,720	187,113	242,385
Granted (in shares)	148,972	157,680	163,579
Vested (in shares)	(157,673)	(81,823)	(216,851)
Forfeited (in shares)	(12,332)	(250)	(2,000)
Balance at the end of the period (in shares)	241,687	262,720	187,113
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 19.55	$ 17.63	$ 27.75
Granted (in dollars per share)	14.65	21.31	16.37
Vested (in dollars per share)	18.81	18.55	27.95
Forfeited (in dollars per share)	18.82	22.05	22.05
Balance at the end of the period (in dollars per share)	$ 17.04	$ 19.55	$ 17.63
Restricted stock units [Member]
Shares
Balance at the beginning of the period (in shares)	84,566	99,345	80,429
Granted (in shares)	50,167	33,895	56,217
Vested (in shares)	(38,405)	(48,674)	(35,001)
Forfeited (in shares)	(9,166)	0	(2,300)
Balance at the end of the period (in shares)	87,162	84,566	99,345
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 18.33	$ 17.59	$ 20.41
Granted (in dollars per share)	13.90	21.25	15.67
Vested (in dollars per share)	17.58	18.87	20.88
Forfeited (in dollars per share)	14.23	0.00	19.01
Balance at the end of the period (in dollars per share)	$ 16.54	$ 18.33	$ 17.59