STOCK-BASED COMPENSATION (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Performance awards
Stock-based compensation
Performance shares award issued	306,100	191,000
Restricted stock units
Stock-based compensation
Exercisable period of grants from grant date		3 years
PLC
Stock-based compensation
Number of shares that may be issued under plans approved by shareowners	9,500,000
Additional equity compensation plan information
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	3,021,189
Weighted-average exercise price of outstanding options, warrants and rights (in dollars per share)	$ 22.15
Number of securities remaining available for future issuance under equity compensation plans, excluding securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	4,530,673
PLC | Equity compensation plans approved by shareowners
Additional equity compensation plan information
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	2,702,768
Weighted-average exercise price of outstanding options, warrants and rights (in dollars per share)	$ 22.15
Number of securities remaining available for future issuance under equity compensation plans, excluding securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	4,530,673
PLC | Equity compensation plans not approved by shareowners
Additional equity compensation plan information
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	318,421
PLC | Performance awards
Stock-based compensation
Period over which ROE is calculated	3 years	3 years
Minimum percentage of Company's ROE to earn awards under 2012 performance awards	10.00%	9.00%
Minimum percentage of Company's ROE to earn maximum awards under 2012 performance awards	11.20%	10.00%
Number of awards earned if Company's ROE is below specified percentage (in shares)	0	0
Performance shares award issued	306,100	191,100
Estimated fair value of performance shares issued	$ 8,608	$ 5,433
PLC | Performance awards | Equity compensation plans approved by shareowners
Additional equity compensation plan information
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	602,160
PLC | SARs
Stock-based compensation
Performance shares award issued	0	0
Estimated fair value of performance shares issued			3,300
Expiration period from date of grant	10 years
Exercisable period of grants from grant date	5 years
Beginning of annual installments from date of grant	1 year
Weighted-Average Base Price per share
Balance at the beginning of the period (in dollars per share)	$ 22.27	$ 21.97	$ 22.28
SARs granted (in dollars per share)			$ 18.34
SARs exercised/forfeited/expired (in dollars per share)	$ 22.60	$ 8.31	$ 20.98
Balance at the end of the period (in dollars per share)	$ 22.15	$ 22.27	$ 21.97
No. of SARs
Balance at the beginning of the period (in shares)	2,274,229	2,324,837	2,469,202
SARs granted (in shares)			344,400
SARs exercised/forfeited/expired (in shares)	(633,062)	(50,608)	(488,765)
Balance at the end of the period (in shares)	1,641,167	2,274,229	2,324,837
PLC | SARs | Minimum
Stock-based compensation
Number of annual installments to exercise stock appreciation rights	3
PLC | SARs | Maximum
Stock-based compensation
Number of annual installments to exercise stock appreciation rights	4
PLC | SARs | Equity compensation plans approved by shareowners
Additional equity compensation plan information
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	1,066,759
Number of shares of common stock assumed to be payable with respect to each outstanding award	1
PLC | Restricted stock units
Stock-based compensation
Performance shares award issued	190,800	175,500
Estimated fair value of performance shares issued	$ 5,400	$ 5,000
PLC | Restricted stock units | Equity compensation plans approved by shareowners
Additional equity compensation plan information
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	646,632
PLC | Deferred Compensation Plan for Officers | Equity compensation plans approved by shareowners
Additional equity compensation plan information
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	319,555
PLC | Deferred Compensation Plan for Officers | Equity compensation plans not approved by shareowners
Additional equity compensation plan information
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	102,318
PLC | Deferred Compensation Plan for Directors Who Are Not Employees of the Company | Equity compensation plans approved by shareowners
Additional equity compensation plan information
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	67,662
PLC | Deferred Compensation Plan for Directors Who Are Not Employees of the Company | Equity compensation plans not approved by shareowners
Additional equity compensation plan information
Number of securities to be issued upon exercise of outstanding options, warrants and rights (in shares)	216,103