STOCK OWNERSHIP AND BENEFIT PLANS - Activity of Nonvested Shares of Restricted Stock and Restricted Stock Units (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted stock
Shares
Balance at the beginning of the period (in shares)	242,385	261,829	237,489
Granted (in shares)	163,579	116,900	116,500
Vested (in shares)	(216,851)	(136,344)	(90,660)
Forfeited (in shares)	(2,000)		(1,500)
Balance at the end of the period (in shares)	187,113	242,385	261,829
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 27.75	$ 30.59	$ 32.82
Granted (in dollars per share)	$ 16.37	$ 20.74	$ 20.90
Vested (in dollars per share)	$ 27.95	$ 27.20	$ 24.16
Forfeited (in dollars per share)	$ 22.05		$ 18.79
Balance at the end of the period (in dollars per share)	$ 17.63	$ 27.75	$ 30.59
Restricted stock units
Shares
Balance at the beginning of the period (in shares)	80,429	53,998	34,583
Granted (in shares)	56,217	50,200	32,500
Vested (in shares)	(35,001)	(20,769)	(13,085)
Forfeited (in shares)	(2,300)	(3,000)
Balance at the end of the period (in shares)	99,345	80,429	53,998
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 20.41	$ 20.43	$ 19.59
Granted (in dollars per share)	$ 15.67	$ 20.44	$ 20.45
Vested (in dollars per share)	$ 20.88	$ 20.43	$ 18.24
Forfeited (in dollars per share)	$ 19.01	$ 21.15
Balance at the end of the period (in dollars per share)	$ 17.59	$ 20.41	$ 20.43