FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Financial Assets and Liabilities Measured at Fair Value (Details) - Measured at fair value on a recurring basis $ in Thousands	Sep. 30, 2018 USD ($)
Level 1
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	$ 0
Level 1 | Interest Rate Swap
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	0
Derivative liability	0
Level 2
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	3,793
Level 2 | Interest Rate Swap
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	3,787
Derivative liability	0
Level 2 | Interest Rate Cap
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	6
Estimated fair value
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	3,793
Estimated fair value | Interest Rate Swap
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	3,787
Derivative liability	0
Estimated fair value | Interest Rate Cap
Financial Instruments Measured at Fair Value: Available-for-sale securities - (Corporate equity securities)
Derivative asset	$ 6