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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Feb. 11, 2016 contracts	Dec. 31, 2015 USD ($)	Dec. 03, 2015 contracts	Nov. 10, 2015 contracts	Nov. 14, 2014 contracts
Fair Value, By Balance Sheet Grouping Disclosure Information [Line Items]
Accumulated other comprehensive loss	$ (232,545)		$ (232,545)			$ (242,409)
Unrealized gain / (loss) on derivative instruments (Note 12)	(1,360)	$ (522)	(5,581)	$ (596)
Forward Contracts [Member]
Fair Value, By Balance Sheet Grouping Disclosure Information [Line Items]
Derivative, Number of Instruments Held \| contracts					1		2
Interest rate swap [Member]
Fair Value, By Balance Sheet Grouping Disclosure Information [Line Items]
Derivative, Number of Instruments Held \| contracts								3	2
Accumulated other comprehensive loss	(7,001)		(7,001)			$ (1,420)
Unrealized gain / (loss) on derivative instruments (Note 12)			(7,302)
Fair Value, Inputs, Level 2 [Member] \| Forward Contracts [Member]
Fair Value, By Balance Sheet Grouping Disclosure Information [Line Items]
Currency forward contracts	$ (398)	$ (2,443)	(11,904)	$ (5,673)
Interest Expense [Member] \| Interest rate swap [Member]
Fair Value, By Balance Sheet Grouping Disclosure Information [Line Items]
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion			$ 1,721