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OTHER COMPREHENSIVE INCOME (Changes in Accumulated Other Comprehensive Income, Net of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
AOCI, Beginning balance			$ (149,466)
Other comprehensive income before reclassifications			2,496
Amounts reclassified from AOCI			3,445
Other comprehensive income	$ 1,144	$ 1,615	5,941	$ 3,117
AOCI, Ending balance	(143,525)	$ (136,259)	(143,525)	$ (136,259)
Interest Rate Hedge Losses [Member]
AOCI, Beginning balance			(11,438)
Other comprehensive income before reclassifications			2,496
Amounts reclassified from AOCI			171
Other comprehensive income			2,667
AOCI, Ending balance	(8,771)		(8,771)
Pension and Postretirement Plan Actuarial Loss and Prior Service Cost [Member]
AOCI, Beginning balance			(138,028)
Other comprehensive income before reclassifications			0
Amounts reclassified from AOCI			3,274
Other comprehensive income			3,274
AOCI, Ending balance	$ (134,754)		$ (134,754)