COMMON STOCK (Details 2) (Stock Options, USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock-Based Awards and Programs
Fair value per dividend equivalent 2010 grants outstanding as of the balance sheet date (in dollars per share)	$ 2.92
Stock options
Outstanding, balance at the beginning of the period (in shares)	190,300	267,400	232,600
Granted (in shares)	0	0	34,800
Exercised (in shares)	27,000	77,100
Outstanding, balance at the end of the period (in shares)	163,300	190,300	267,400
Exercisable (in shares)	128,500	128,500	149,200
Weighted Average Exercise Price
Outstanding, balance at the beginning of the period (in dollars per option)	$ 21.56	$ 21.69	$ 22.19
Granted (in dollars per share)			$ 18.36
Exercised (in dollars per share)	$ 18.12	$ 22.02
Outstanding, balance at the end of the period (in dollars per option)	$ 22.13	$ 21.56	$ 21.69
Exercisable (in dollars per share)	$ 23.15	$ 23.15	$ 23.04
Aggregate intrinsic value
Aggregate intrinsic value of unexercised options	$ 0.1	$ 0.2	$ 0.3
Weighted-average remaining contractual life of outstanding options	3 years 2 months 12 days	5 years 1 month 6 days	6 years 7 months 6 days
Range of exercise prices, low end of range (in dollars per share)	$ 18.36	$ 18.12	$ 18.12
Range of exercise prices, high end of range (in dollars per share)	$ 23.81	$ 23.81	$ 23.81
Total unrecognized compensation expense related to non-vested options and related dividend equivalents granted under the plan		0.1	0.2
Recognition period, low end of range			1 year
Recognition period, high end of range			3 years
Recognition period	1 month	1 year
Maximum
Aggregate intrinsic value
Total unrecognized compensation expense related to non-vested options and related dividend equivalents granted under the plan	$ 0.1