FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2012	Mar. 31, 2011	Jun. 30, 2012 Fair value measured on a recurring basis Significant Unobservable Inputs (Level 3)	Mar. 31, 2012 Fair value measured on a recurring basis Significant Unobservable Inputs (Level 3)	Jun. 30, 2012 Fair value measured on a recurring basis Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2012 Fair value measured on a recurring basis Fair Value, Inputs, Level 2 [Member]	Jul. 01, 2015 Aviation Network Services, LLC [Member]	Jul. 01, 2014 Aviation Network Services, LLC [Member]	Jul. 01, 2013 Aviation Network Services, LLC [Member]	Oct. 31, 2011 Aviation Network Services, LLC [Member]	Jun. 30, 2012 Minimum [Member]	Jun. 30, 2012 Maximum [Member]
Fair value of assets measured on a recurring basis
Business Acquisition, Contingent Consideration, Potential Cash Payment									$ 1,000	$ 900	$ 1,100		$ 0	$ 3,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(18)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(113)	232
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(2,401)	(2,870)	(2,019)	(2,870)	(2,401)	(2,019)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, Sales, Issues, Settlements	0	0
Contingent consideration												(1,926)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	(382)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0
Derivative Liability, Fair Value, Gross Liability							(29)	212
Notional Amount of Foreign Currency Derivatives	6,299
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 9	$ (232)