SEGMENT INFORMATION - Operating Performance and Total Assets by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Segment Reporting Information [Line Items]
Assets	$ 3,088,523		$ 3,088,523		$ 3,113,847
Total earnings from unconsolidated affiliates, net of losses - equity method investments	2,063	$ 138	1,398	$ 3,968
Loss on disposal of assets	(8,526)	(2,186)	(7,827)	(12,203)
Operating loss	(12,917)	(26,882)	(37,506)	(53,117)
Depreciation and amortization	31,381	28,592	62,437	63,286
Total investments in unconsolidated affiliates - equity method	205,213		205,213		203,876
Accelerated depreciation		1,300		8,200
Construction in progress within property and equipment	68,400		68,400		199,300
Europe Caspian
Segment Reporting Information [Line Items]
Assets	1,060,635		1,060,635		1,091,536
Total earnings from unconsolidated affiliates, net of losses - equity method investments	61	65	91	116
Total business unit operating income	9,891	5,741	14,298	18,771
Depreciation and amortization	12,196	11,220	24,018	22,409
Total investments in unconsolidated affiliates - equity method	309		309		257
Accelerated depreciation		200		400
Africa
Segment Reporting Information [Line Items]
Assets	431,588		431,588		325,719
Total business unit operating income	7,835	7,942	17,883	9,513
Depreciation and amortization	3,590	3,220	6,666	8,673
Accelerated depreciation		1,100		3,900
Americas
Segment Reporting Information [Line Items]
Assets	869,584		869,584		809,071
Total earnings from unconsolidated affiliates, net of losses - equity method investments	2,150	260	1,615	4,123
Total business unit operating income	7,483	2,643	6,227	3,564
Depreciation and amortization	6,998	7,228	13,997	18,609
Total investments in unconsolidated affiliates - equity method	201,737		201,737		200,362
Accelerated depreciation				3,900
Asia Pacific
Segment Reporting Information [Line Items]
Assets	360,157		360,157		433,614
Total business unit operating income	(5,903)	(9,575)	(18,433)	(15,468)
Depreciation and amortization	5,058	4,377	10,868	8,613
Corporate and other
Segment Reporting Information [Line Items]
Assets	366,559		366,559		453,907
Total earnings from unconsolidated affiliates, net of losses - equity method investments	(148)	(187)	(308)	(271)
Total business unit operating income	(23,697)	(31,447)	(49,654)	(57,294)
Depreciation and amortization	3,539	$ 2,547	6,888	$ 4,982
Total investments in unconsolidated affiliates - equity method	$ 3,167		$ 3,167		$ 3,257