INDEBTEDNESS - Schedule of Per Annum Fees Charged and Interest Rate Margins (Details)	12 Months Ended
	Dec. 31, 2019
Greater than or equal to 3.50 to 1.0
Line of Credit Facility [Line Items]
Instrument fee	1.20%
Between 3.50 to 1.0 and 2.50 to 1.0
Line of Credit Facility [Line Items]
Instrument fee	1.05%
Between 2.50 to 1.0 and 1.50 to 1.0
Line of Credit Facility [Line Items]
Instrument fee	0.90%
Less than 1.50 to 1.0
Line of Credit Facility [Line Items]
Instrument fee	0.75%
LIBOR | Greater than or equal to 3.50 to 1.0
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.00%
LIBOR | Between 3.50 to 1.0 and 2.50 to 1.0
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
LIBOR | Between 2.50 to 1.0 and 1.50 to 1.0
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.50%
LIBOR | Less than 1.50 to 1.0
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.25%
ABR | Greater than or equal to 3.50 to 1.0
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
ABR | Between 3.50 to 1.0 and 2.50 to 1.0
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.75%
ABR | Between 2.50 to 1.0 and 1.50 to 1.0
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
ABR | Less than 1.50 to 1.0
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.25%
Domestic Revolving Commitment Fee | Greater than or equal to 3.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.30%
Domestic Revolving Commitment Fee | Between 3.50 to 1.0 and 2.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.275%
Domestic Revolving Commitment Fee | Between 2.50 to 1.0 and 1.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.25%
Domestic Revolving Commitment Fee | Less than 1.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.225%
Global Revolving Commitment Fee | Greater than or equal to 3.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.30%
Global Revolving Commitment Fee | Between 3.50 to 1.0 and 2.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.275%
Global Revolving Commitment Fee | Between 2.50 to 1.0 and 1.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.25%
Global Revolving Commitment Fee | Less than 1.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.225%
Financial Letter of Credit Fee | Greater than or equal to 3.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	2.00%
Financial Letter of Credit Fee | Between 3.50 to 1.0 and 2.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	1.75%
Financial Letter of Credit Fee | Between 2.50 to 1.0 and 1.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	1.50%
Financial Letter of Credit Fee | Less than 1.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	1.25%
FCI Commitment Fee | Greater than or equal to 3.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.30%
FCI Commitment Fee | Between 3.50 to 1.0 and 2.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.275%
FCI Commitment Fee | Between 2.50 to 1.0 and 1.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.25%
FCI Commitment Fee | Less than 1.50 to 1.0
Line of Credit Facility [Line Items]
Commitment fee	0.225%