FAIR VALUE MEASUREMENTS (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 item	Mar. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Number of Rabbi Trust estabished	2
Total gain of the Rabbi Trust investment	$ 807,000	$ 2,395,000
Unrealized gains	646,000	1,995,000
Assets subject to fair value measurement on a nonrecurring basis	0
Liabilities subject to fair value measurement on a nonrecurring basis	0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loss on impairment of long-lived assets		2,987,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets subject to fair value measurement on a nonrecurring basis	$ 2,280,000	$ 2,280,000