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STOCKHOLDERS' EQUITY (Details) (USD $) In Thousands, except Per Share data	3 Months Ended						6 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Comprehensive income (loss)
Total comprehensive income (loss)		$ 6,402			$ (6,510)		$ (5,296)	$ (26,624)
Accumulated other comprehensive loss, pre-tax amounts:
Foreign currency translation		(468)					(468)		(514)
Unrecognized net periodic benefit costs		(55,122)					(55,122)		(58,707)
Increase in fair value of available for sale security		195					195		202
Total pre-tax amount		(55,395)					(55,395)		(59,019)
Accumulated other comprehensive loss, after-tax amounts:
Foreign currency translation		(287)					(287)		(315)
Unrecognized net periodic benefit costs		(33,679)					(33,679)		(35,870)
Increase in fair value of available for sale security		127					127		132
Total after-tax amount		(33,839)					(33,839)		(36,053)
Dividends on Common Stock
Dividends declared (in dollars per share)	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.06	$ 0.06
Dividend Amount	$ 797	$ 797	$ 788	$ 786	$ 777	$ 777	$ 1,585