CREDIT FACILITY (Details) - USD ($) $ in Thousands	Apr. 07, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019
Line of Credit Facility [Line Items]
Fair value of long-term debt		$ 334,800
Long-term debt		$ 334,785	$ 339,027
Revolving Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity				$ 500,000
Unused line fee payment percentage		0.10%
Credit availability under the Loan Agreement		$ 150,000
Revolving Facility [Member] | Bank of America N.A. [Member]
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity		$ 150,000
Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity				350,000
Unsecured Revolving Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity				$ 150,000
Revolving Credit Facility and Term Loan Facility
Line of Credit Facility [Line Items]
Effective rate percentage		1.74%
Subsequent Event [Member] | Interest Rate Swap [Member]
Line of Credit Facility [Line Items]
Derivative, notional amount	$ 286,300
Loan value, percentage	85.00%
Basis points	75
Subsequent Event [Member] | Interest Rate Swap [Member] | Maximum
Line of Credit Facility [Line Items]
Average fixed rate	1.271%
Subsequent Event [Member] | Interest Rate Swap [Member] | Minimum
Line of Credit Facility [Line Items]
Average fixed rate	0.521%