COMMON STOCK (Details 2) (Stock Options, USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010 Y	Dec. 31, 2009 Y
Stock-Based Awards and Programs
Period after which stock options become exercisable from the date of grant(in years)	3 years
Award expiration (in years)	P10Y
Fair value per dividend equivalent 2010 grants outstanding as of the balance sheet date (in dollars per share)	$ 3.20
Fair value per dividend equivalent 2009 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)	267,400	232,600	205,600
Granted (in shares)	0	34,800	27,000
Exercised (in shares)	(77,100)
Outstanding, balance at the end of the period (in shares)	190,300	267,400	232,600
Exercisable (in shares)	128,500	149,200	85,000
Weighted Average Exercise Price
Outstanding, balance at the beginning of the period (in dollars per option)	$ 21.69	$ 22.19	$ 22.73
Granted (in dollars per share)		$ 18.36	$ 18.12
Exercised (in dollars per share)	$ 22.02
Outstanding, balance at the end of the period (in dollars per option)	$ 21.56	$ 21.69	$ 22.19
Exercisable (in dollars per share)	$ 23.15	$ 23.04	$ 22.46
Aggregate intrinsic value
Aggregate intrinsic value of unexercised options	$ 0.2	$ 0.3	$ 0
Weighted-average remaining contractual life of outstanding options (in years)	5.1	6.6	6.6
Range of exercise prices, low end of range (in dollars per share)	$ 18.12	$ 18.12	$ 18.12
Range of exercise prices, high end of range (in dollars per share)	$ 23.81	$ 23.81	$ 23.81
Number of shares vested and exercisable	128,500	149,200	85,000
Weighted average price of shares vested and exercisable (in dollars per share)	$ 23.15	$ 23.04	$ 22.46
Total unrecognized compensation expense related to non-vested options and related dividend equivalents granted under the plan	$ 0.1	$ 0.2	$ 0.2
Recognition period	1
Intrinsic value of unexercised options if closing price of stock is less than the exercise price (in dollars per share)	$ 0
Minimum
Aggregate intrinsic value
Recognition period		1
Maximum
Aggregate intrinsic value
Recognition period		3