SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents, noncurrent	$ 17,029		$ 57,618	$ 60,572
Amortization of financing costs		$ 851	$ 1,230
10.75% Subordinated Notes [Member]
Summary Of Significant Accounting Policies [Line Items]
Debt instrument, interest rate, stated percentage	10.75%
2020 Debt Facilities [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred finance costs, gross	$ 7,329
Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	94.00%			88.00%
Term Loan [Member] | Core Term Loan Facility, Core Transition Facility, Sinosure Credit Facility and 8.5% Senior Notes [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred finance costs, gross	$ 9,216			$ 16,309,000
Term Loan [Member] | Core Revolving Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred finance costs, gross	752
Revolving Credit Facility [Member] | INSW Facilities [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred finance costs, gross				$ 274
Revolving Credit Facility [Member] | Core Revolving Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Deferred finance costs, gross	$ 980