TAXES Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Deferred tax assets:
Foreign tax credits	$ 9,140	$ 39,554
State net operating losses	12,337	8,432
Net operating losses	98,911	97,878
Accrued pension liability	6,289	10,445
Accrued equity compensation	10,172	17,162
Deferred revenue	688	1,446
Employee award programs	1,603	4,343
Employee payroll accruals	4,426	5,328
Inventories	1,666	3,111
Investment in unconsolidated affiliates	28,778	17,099
Other	5,543	5,865
Valuation allowance	(71,987)	(74,727)	$ (29,373)	$ (11,700)
Total deferred tax assets	107,566	135,936
Deferred tax liabilities:
Property and equipment	(150,224)	(220,305)
Inventories	(2,070)	(1,967)
Investment in unconsolidated affiliates	(21,470)	(28,631)
Employee programs	(1,224)	(1,033)
Deferred gain	(2,691)	(3,208)
Other	(4,155)	(5,371)
Total deferred tax liabilities	(181,834)	(260,515)
Net deferred tax liabilities	(74,268)	(124,579)
Valuation Allowance, Foreign Tax Credit Carryforward
Deferred tax assets:
Valuation allowance	(9,140)	(31,974)
Valuation Allowance, State Operating Loss Carryforward
Deferred tax assets:
Valuation allowance	(12,337)	(8,432)
Valuation Allowance, Foreign Operating Loss Carryforwards
Deferred tax assets:
Valuation allowance	$ (50,510)	$ (34,321)