STOCK OWNERSHIP AND BENEFIT PLANS - Activity of Nonvested Shares of Restricted Stock and Restricted Stock Units (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted stock [Member]
Shares
Balance at the beginning of the period (in shares)	241,687	262,720	187,113
Granted (in shares)	228,532	148,972	157,680
Vested (in shares)	(144,008)	(157,673)	(81,823)
Forfeited (in shares)	(42,634)	(12,332)	(250)
Balance at the end of the period (in shares)	283,577	241,687	262,720
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 17.04	$ 19.55	$ 17.63
Granted (in dollars per share)	8.07	14.65	21.31
Vested (in dollars per share)	15.08	18.81	18.55
Forfeited (in dollars per share)	10.82	18.82	22.05
Balance at the end of the period (in dollars per share)	$ 11.74	$ 17.04	$ 19.55
Restricted stock units [Member]
Shares
Balance at the beginning of the period (in shares)	87,162	84,566	99,345
Granted (in shares)	48,855	50,167	33,895
Vested (in shares)	(40,836)	(38,405)	(48,674)
Forfeited (in shares)	0	(9,166)	0
Balance at the end of the period (in shares)	95,181	87,162	84,566
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 16.54	$ 18.33	$ 17.59
Granted (in dollars per share)	6.88	13.90	21.25
Vested (in dollars per share)	16.24	17.58	18.87
Forfeited (in dollars per share)	0.00	14.23	0.00
Balance at the end of the period (in dollars per share)	$ 11.71	$ 16.54	$ 18.33