ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (INCOME STATEMENT CLASSIFICATION TABLE) (DETAILS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Presentation of Income Statement Reclassifications [Line Items]
Other Comprehensive Income Loss Reclassified to Income			$ 2,895	$ 2,697
Net Income (Loss) [Member] | Derivative Valuation [Member]
Presentation of Income Statement Reclassifications [Line Items]
Other Comprehensive Income Loss Reclassified to Income	$ (1,301)	$ (1,059)	(2,441)	(2,174)
Net Income (Loss) [Member] | Other Accumulated Other Comprehensive Income Loss [Member]
Presentation of Income Statement Reclassifications [Line Items]
Other Comprehensive Income Loss Reclassified to Income	(208)	(262)	(454)	(523)
Gain Loss on Foreign Currency Forward Contracts [Member] | Revenue [Member] | Derivative Valuation [Member]
Presentation of Income Statement Reclassifications [Line Items]
Other Comprehensive Income Loss Reclassified to Income	(2,506)	(1,472)	(4,213)	(3,043)
Loss on Interest Rate Swaps [Member] | Interest Expenses [Member] | Derivative Valuation [Member]
Presentation of Income Statement Reclassifications [Line Items]
Other Comprehensive Income Loss Reclassified to Income	(262)	(265)	(519)	(523)
Tax Effect [Member] | Provision for Income Taxes [Member] | Derivative Valuation [Member]
Presentation of Income Statement Reclassifications [Line Items]
Other Comprehensive Income Loss Reclassified to Income	1,467	678	2,291	1,392
Tax Effect [Member] | Provision for Income Taxes [Member] | Other Accumulated Other Comprehensive Income Loss [Member]
Presentation of Income Statement Reclassifications [Line Items]
Other Comprehensive Income Loss Reclassified to Income	22	18	50	33
Actuarial Loss on Defined Benefit Plan [Member] | Cost of Services [Member] | Other Accumulated Other Comprehensive Income Loss [Member]
Presentation of Income Statement Reclassifications [Line Items]
Other Comprehensive Income Loss Reclassified to Income	$ (230)	$ (280)	$ (504)	$ (556)