DEBT (Schedule of Principal and Interest Debt Payments) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
DEBT [Abstract]
2018, Total	$ 493,801
2019, Total	111,068
2020, Total	363,480
2021, Total	308,537
2022, Total	82,309
2018, Principal	391,383
2019, Principal	12,523
2020, Principal	268,775
2021, Principal	218,526
2022, Principal	28
2018, Interest	102,418
2019, Interest	98,545
2020, Interest	94,705
2021, Interest	90,011
2022, Interest	$ 82,281