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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Jan. 31, 2017 contracts	Dec. 31, 2016 USD ($)	Nov. 10, 2015 contracts	Nov. 14, 2014 contracts
Fair Value, By Balance Sheet Grouping Disclosure Information [Line Items]
Accumulated other comprehensive loss	$ (240,566)			$ (243,988)
Unrealized gain / (loss) on derivative instruments (Note 12)	1,258	$ (1,248)
Forward Contracts [Member]
Fair Value, By Balance Sheet Grouping Disclosure Information [Line Items]
Derivative, Number of Instruments Held \| contracts			1
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	(3,193)			$ (4,451)
Unrealized gain / (loss) on derivative instruments (Note 12)	(573)
Fair Value, Inputs, Level 2 [Member] \| Currency Swap [Member]
Fair Value, By Balance Sheet Grouping Disclosure Information [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	368	$ (14,050)
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	$ 685