SEVERANCE PROGRAMS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent		5.00%
Other operating expense recorded for severance costs		$ 197
NPC [Member]
Restructuring Cost and Reserve [Line Items]
Other operating expense recorded for severance costs	222	6,700
SPPC [Member]
Restructuring Cost and Reserve [Line Items]
Other operating expense recorded for severance costs	$ 864	$ 6,300