STOCKHOLDERS' EQUITY (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Amortization of unrecognized net periodic benefit costs:
INCOME (LOSS) BEFORE INCOME TAXES	$ 7,865	$ 6,084	$ (15,438)	$ (16,452)
Tax benefit	(2,987)	5,757	6,921	10,131
NET INCOME (LOSS)	4,878	11,841	(8,517)	(6,321)
Unrecognized Net Periodic Benefit Costs | Amount Reclassified from Accumulated Other Comprehensive Loss
Amortization of unrecognized net periodic benefit costs:
Net actuarial loss			(5,824)
Prior service credit			95
INCOME (LOSS) BEFORE INCOME TAXES			(5,729)
Tax benefit			2,229
NET INCOME (LOSS)			$ (3,500)