FINANCIAL INSTRUMENTS - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting of Derivative Assets
Gross Amounts of Recognized Assets		$ 18,033
Gross Amounts Offset in the Balance Sheet	$ 31	1,552
Net amounts of assets presented in the balance sheet	31	19,585
Financial Instruments	(31)	(1,552)
Net Amount		18,033
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	(2,391)
Gross Amounts Offset in the Balance Sheet	(31)	(1,552)
Net amounts of liabilities presented in the balance sheet	(2,422)	(1,552)
Financial Instruments	31	1,552
Net Amount	(2,391)
Counterparty 1
Offsetting of Derivative Assets
Gross Amounts of Recognized Assets		15,577
Gross Amounts Offset in the Balance Sheet	22	1,314
Net amounts of assets presented in the balance sheet	22	16,891
Financial Instruments	(22)	(1,314)
Net Amount		15,577
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	(2,226)
Gross Amounts Offset in the Balance Sheet	(22)
Net amounts of liabilities presented in the balance sheet	(2,248)
Financial Instruments	22
Net Amount	(2,226)
Counterparty 2
Offsetting of Derivative Assets
Gross Amounts of Recognized Assets		975
Gross Amounts Offset in the Balance Sheet	9	80
Net amounts of assets presented in the balance sheet	9	1,055
Financial Instruments	(9)	(80)
Net Amount		975
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	(8)
Gross Amounts Offset in the Balance Sheet	(9)
Net amounts of liabilities presented in the balance sheet	(17)
Financial Instruments	9
Net Amount	(8)
Counterparty 3
Offsetting of Derivative Assets
Gross Amounts of Recognized Assets		1,481
Gross Amounts Offset in the Balance Sheet		158
Net amounts of assets presented in the balance sheet		1,639
Financial Instruments		(158)
Net Amount		1,481
Offsetting of Derivative Liabilities
Gross Amounts of Recognized Liabilities	(157)
Net amounts of liabilities presented in the balance sheet	(157)
Net Amount	$ (157)
Interest rate swap | Counterparty 1
Offsetting of Derivative Liabilities
Gross Amounts Offset in the Balance Sheet		(1,314)
Net amounts of liabilities presented in the balance sheet		(1,314)
Financial Instruments		1,314
Interest rate swap | Counterparty 2
Offsetting of Derivative Liabilities
Gross Amounts Offset in the Balance Sheet		(80)
Net amounts of liabilities presented in the balance sheet		(80)
Financial Instruments		80
Interest rate swap | Counterparty 3
Offsetting of Derivative Liabilities
Gross Amounts Offset in the Balance Sheet		(158)
Net amounts of liabilities presented in the balance sheet		(158)
Financial Instruments		$ 158