CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Nov. 10, 2016
Non-cash investing and financing activities
Cash paid for interest	$ 21,927	$ 20,623
Cash paid for estimated income taxes	0	0
Secured Debt | $400 Million Credit Facility
Non-cash investing and financing activities
Face amount of term loan facility	400,000	400,000	$ 400,000	$ 400,000
Accounts payable and accrued expenses
Non-cash investing and financing activities
Non-cash investing activities purchase of vessels, including deposits	2,478	1,000
Net proceeds from sale of vessels		253
Non-cash investing activities purchase of scrubbers	7,420
Non-cash investing activities purchase of other fixed assets	$ 427	34
Non-cash financing activities deferred financing fees		350
Non-cash financing activities common stock issuance costs		$ 90