BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Intangible Assets (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2018 USD ($)
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 27,686
Foreign currency translation	(272)
Intangible assets - ending balance	27,414
Accumulated amortization of intangible assets - beginning balance	(22,388)
Amortization expense	(213)
Accumulated amortization of intangible assets - ending balance	$ (22,601)
Weighted average remaining contractual life, in years	5 years 7 months
Customer contracts
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 8,169
Foreign currency translation	0
Intangible assets - ending balance	8,169
Accumulated amortization of intangible assets - beginning balance	(8,169)
Amortization expense	0
Accumulated amortization of intangible assets - ending balance	$ (8,169)
Weighted average remaining contractual life, in years	0 years
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 12,777
Foreign currency translation	(52)
Intangible assets - ending balance	12,725
Accumulated amortization of intangible assets - beginning balance	(11,372)
Amortization expense	(72)
Accumulated amortization of intangible assets - ending balance	$ (11,444)
Weighted average remaining contractual life, in years	4 years 5 months
Trade name and trademarks
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 4,878
Foreign currency translation	(208)
Intangible assets - ending balance	4,670
Accumulated amortization of intangible assets - beginning balance	(1,213)
Amortization expense	(72)
Accumulated amortization of intangible assets - ending balance	$ (1,285)
Weighted average remaining contractual life, in years	11 years 9 months
Internally developed software
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 1,107
Foreign currency translation	(11)
Intangible assets - ending balance	1,096
Accumulated amortization of intangible assets - beginning balance	(915)
Amortization expense	(54)
Accumulated amortization of intangible assets - ending balance	$ (969)
Weighted average remaining contractual life, in years	7 months
Licenses
Finite-lived Intangible Assets [Roll Forward]
Intangible assets - beginning balance	$ 755
Foreign currency translation	(1)
Intangible assets - ending balance	754
Accumulated amortization of intangible assets - beginning balance	(719)
Amortization expense	(15)
Accumulated amortization of intangible assets - ending balance	$ (734)
Weighted average remaining contractual life, in years	4 months