FAIR VALUE MEASUREMENTS (Narrative) (Details)	6 Months Ended
	Jun. 30, 2015 USD ($) item	Jun. 30, 2014 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Number of Rabbi Trust established | item	2
Total gain of the Rabbi Trust investment	$ 184,000	$ 3,428,000
Unrealized gains (losses)	22,000	1,480,000
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	5,190,000	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	$ 0	$ 2,280,000