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DERIVATIVE FINANCIAL INSTRUMENTS (Details) $ in Thousands, € in Millions, ¥ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 JPY (¥)	Jun. 30, 2015 EUR (€)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2014 JPY (¥)	Jun. 30, 2014 EUR (€)	Dec. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 560,209	$ 650,027	$ 1,103,541	$ 1,321,088
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	(63,251)		(63,251)					$ (51,521)
Deferred tax assets	33,500		33,500								$ 40,000
Correct Out-of-Period Error Related to Certain Tax Effects of a Prior Period Net Investment Hedge [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)							$ 0
Deferred tax assets							$ 0
Accumulated Unrealized Gains (Losses) on Foreign Currency Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	100		100					1,100
Accumulated Unrealized Gains (Losses) on Foreign Currency Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	800	300	2,000	700
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	(63,300)		(63,300)					(52,600)
Forward Contracts [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Fair value of hedges	0		0					$ 0
Forward Contracts [Member] | Cash Flow Hedges [Member] | Japanese Yen [Member]
Derivative [Line Items]
Notional amount	10,600	$ 18,700	10,600	$ 18,700	¥ 1.3				¥ 1,900.0
Forward Contracts [Member] | Cash Flow Hedges [Member] | Euros [Member]
Derivative [Line Items]
Notional amount	$ 13,500		$ 13,500			€ 15.0				€ 10.0		$ 13,700

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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