TAXES Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Deferred tax assets:
Foreign tax credits	$ 39,554	$ 9,140
State net operating losses	12,448	12,337
Net operating losses	102,074	98,911
Accrued pension liability	4,254	6,289
Accrued equity compensation	9,115	10,172
Interest expense limitation	17,852	0
Deferred revenue	511	688
Employee award programs	387	1,603
Employee payroll accruals	3,476	4,426
Inventories	1,263	1,666
Investment in unconsolidated affiliates	30,783	28,778
Convertible note	2,013	0
Capital loss carryover	4,200	0
Accrued expenses not currently deductible	6,339	3,240
Other	7,005	2,303
Valuation allowance	(128,214)	(71,987)	$ (74,727)	$ (29,373)
Total deferred tax assets	113,060	107,566
Deferred tax liabilities:
Property and equipment	(136,175)	(150,224)
Inventories	(1,754)	(2,070)
Investment in unconsolidated affiliates	(27,595)	(21,470)
Employee programs	0	(1,224)
Deferred gain	(1,872)	(2,691)
Other	(4,872)	(4,155)
Total deferred tax liabilities	(172,268)	(181,834)
Net deferred tax liabilities	(59,208)	(74,268)
Valuation Allowance, Foreign Tax Credit Carryforward
Deferred tax assets:
Valuation allowance	(39,554)	(9,140)
Valuation Allowance, Operating Loss Carryforwards | State and Local Jurisdiction [Member]
Deferred tax assets:
Valuation allowance	(12,448)	(12,337)
Valuation Allowance, Operating Loss Carryforwards | Foreign Tax Authority [Member]
Deferred tax assets:
Valuation allowance	$ (76,212)	$ (50,510)