EQUITY - Reclassification from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
EQUITY
Income (loss) before income taxes	$ 20,664	$ (10,331)
Interest expense	(32,095)	(34,283)
Tax benefit	(5,041)	3,145
Net income (loss)	15,623	(7,186)
Pension and Post-Retirement Obligations
EQUITY
Prior service (cost) credit	(442)	(798)
Actuarial loss	(12)	(595)
Income (loss) before income taxes	(454)	(1,393)
Tax benefit	118	367
Net income (loss)	(336)	(1,026)
Derivative Instruments
EQUITY
Interest expense	(2,175)	280
Tax benefit	567	(73)
Net income (loss)	$ (1,608)	$ 207