DERIVATIVE FINANCIAL INSTRUMENTS - Changes in Net Gain or Loss on Cash Flow Hedges Included in Accumulated Other Comprehensive Loss (Details) - Interest rate swap agreements - Cash flow hedges - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Changes in Net Gain or Loss on Cash Flow Hedges Included in Accumulated Other Comprehensive Loss
Balance at the beginning of the period	$ 2,936
Unrealized loss recognized in other comprehensive loss, net of tax	3,151	$ 2,538
Reclassification to interest expense, net	(215)	(248)
Balance at the end of the period	$ 5,872	$ 2,290

DERIVATIVE FINANCIAL INSTRUMENTS - Changes in Net Gain or Loss on Cash Flow Hedges Included in Accumulated Other Comprehensive Loss (Details) - Interest rate swap agreements - Cash flow hedges - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Changes in Net Gain or Loss on Cash Flow Hedges Included in Accumulated Other Comprehensive Loss

Balance at the beginning of the period

$ 2,936

Unrealized loss recognized in other comprehensive loss, net of tax

3,151

$ 2,538

Reclassification to interest expense, net

(215)

(248)

Balance at the end of the period

$ 5,872

$ 2,290