SEGMENT INFORMATION - Operating Performance and Total Assets by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Segment Reporting Information [Line Items]
Assets	$ 2,731,744		$ 2,731,744		$ 3,165,002
Total earnings from unconsolidated affiliates, net of losses - equity method investments	737	$ 1,996	(2,376)	$ 3,394
Loss on disposal of assets	(16,015)	(4,591)	(18,986)	(12,418)
Operating loss	(31,164)	(3,527)	(164,653)	(41,091)
Depreciation and amortization	30,615	31,682	92,045	94,119
Total investments in unconsolidated affiliates - equity method	107,688		107,688		119,884
Construction in progress within property and equipment	52,900		52,900		67,700
Contract termination costs	13,971	0	13,971	0
OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense	1,000		6,900		16,600
Europe Caspian
Segment Reporting Information [Line Items]
Assets	904,490		904,490		1,087,437
Total earnings from unconsolidated affiliates, net of losses - equity method investments	(2)	34	17	125
Total business unit operating income	3,342	5,274	13,856	19,499
Depreciation and amortization	13,041	12,771	37,985	36,789
Total investments in unconsolidated affiliates - equity method	215		215		270
Europe Caspian | OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense	200		4,600
Africa
Segment Reporting Information [Line Items]
Assets	398,606		398,606		374,121
Total business unit operating income	5,286	10,470	7,892	28,353
Depreciation and amortization	3,732	3,664	10,811	10,330
Americas
Segment Reporting Information [Line Items]
Assets	751,981		751,981		788,879
Total earnings from unconsolidated affiliates, net of losses - equity method investments	839	2,097	(2,052)	3,712
Total business unit operating income	4,412	5,308	(1,362)	11,535
Depreciation and amortization	7,108	6,909	21,299	20,906
Total investments in unconsolidated affiliates - equity method	104,758		104,758		116,276
Asia Pacific
Segment Reporting Information [Line Items]
Assets	248,861		248,861		342,166
Total business unit operating income	(6,654)	(941)	(14,613)	(19,374)
Depreciation and amortization	3,812	4,479	12,221	15,347
Asia Pacific | OEM Cost recoveries | Rent Expense
Segment Reporting Information [Line Items]
Offset Amount, Expense	800		2,300
Corporate and other
Segment Reporting Information [Line Items]
Assets	427,806		427,806		572,399
Total earnings from unconsolidated affiliates, net of losses - equity method investments	(100)	(135)	(341)	(443)
Total business unit operating income	(21,535)	(19,047)	(151,440)	(68,686)
Depreciation and amortization	2,922	$ 3,859	9,729	$ 10,747
Total investments in unconsolidated affiliates - equity method	$ 2,715		$ 2,715		$ 3,338