BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Changes in Foreign Currency Exchange Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017
Schedule of Foreign Currency [Line Items]
Revenue	$ 350,657	$ 373,676	$ 718,551	$ 725,785
Operating expense	(361,739)	(380,159)	(728,736)	(755,728)
Earnings (losses) from unconsolidated affiliates, net	(96)	2,063	(3,113)	1,398
Loss before benefit (provision) for income taxes	(159,328)	(28,922)	(194,220)	(71,177)
Benefit for income taxes	15,655	(2,474)	18,506	(15,965)
Net income (loss)	(143,673)	(31,396)	(175,714)	(87,142)
Total stockholders’ investment	975,181	$ 1,233,028	975,181	$ 1,233,028	$ 1,125,593	$ 1,183,093	$ 1,250,790	$ 1,294,232
Quarter To Date [Member] | Impact of Changes in Foreign Currency Exchange Rates
Schedule of Foreign Currency [Line Items]
Revenue	(5,257)
Operating expense	4,913
Earnings (losses) from unconsolidated affiliates, net	(1,278)
Non-operating expense	(4,831)
Loss before benefit (provision) for income taxes	(6,453)
Benefit for income taxes	1,280
Net income (loss)	(5,173)
Cumulative translation adjustment	(7,999)
Total stockholders’ investment	(13,172)		(13,172)
Year To Date | Impact of Changes in Foreign Currency Exchange Rates
Schedule of Foreign Currency [Line Items]
Revenue			5,192
Operating expense			(273)
Earnings (losses) from unconsolidated affiliates, net			(2,718)
Non-operating expense			(6,182)
Loss before benefit (provision) for income taxes			(3,981)
Benefit for income taxes			1,193
Net income (loss)			(2,788)
Cumulative translation adjustment			(37,171)
Total stockholders’ investment	$ (39,959)		$ (39,959)