FAIR VALUE MEASUREMENTS (Details) - Recurring basis - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value Measurements at Reporting Date
Derivative assets	$ 1,311	$ 3,901
Derivative liabilities	(8,168)	(9,712)
Quoted Prices in Active Markets for Identical Assets/(Liabilities) (Level 1)
Fair Value Measurements at Reporting Date
Derivative assets	18	1
Derivative liabilities	(8,168)	(9,712)
Significant Other Observable Inputs (Level 2)
Fair Value Measurements at Reporting Date
Derivative assets	$ 1,293	$ 3,900