FINANCIAL INSTRUMENTS - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Offsetting of Derivative Assets
Gross Amounts of Recognized Assets	$ 19,717	$ 18,033
Gross Amounts Offset in the Balance Sheet	125	1,552
Net amounts of assets presented in the balance sheet	19,842	19,585
Financial Instruments	(125)	(1,552)
Net Amount	19,717	18,033
Offsetting of Derivative Liabilities
Gross Amounts Offset in the Balance Sheet	(125)	(1,552)
Net amounts of liabilities presented in the balance sheet	(125)	(1,552)
Financial Instruments	125	1,552
Counterparty 1
Offsetting of Derivative Assets
Gross Amounts of Recognized Assets	16,970	15,577
Gross Amounts Offset in the Balance Sheet	125	1,314
Net amounts of assets presented in the balance sheet	17,095	16,891
Financial Instruments	(125)	(1,314)
Net Amount	16,970	15,577
Offsetting of Derivative Liabilities
Gross Amounts Offset in the Balance Sheet	(125)
Net amounts of liabilities presented in the balance sheet	(125)
Financial Instruments	125
Counterparty 2
Offsetting of Derivative Assets
Gross Amounts of Recognized Assets	1,117	975
Gross Amounts Offset in the Balance Sheet		80
Net amounts of assets presented in the balance sheet	1,117	1,055
Financial Instruments		(80)
Net Amount	1,117	975
Counterparty 3
Offsetting of Derivative Assets
Gross Amounts of Recognized Assets	1,630	1,481
Gross Amounts Offset in the Balance Sheet		158
Net amounts of assets presented in the balance sheet	1,630	1,639
Financial Instruments		(158)
Net Amount	$ 1,630	1,481
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