CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		6 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Operating activities:
Net loss		$ (266,266)	$ (59,163)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization		88,397	91,636
Provision for deferred income taxes			128
Gain on asset dispositions, net		(11,896)	(13,462)
Asset impairments	[1]	166,448	46,630
Equity in earnings (losses) of unconsolidated companies, less dividends		(1,659)	6,424
Compensation expense - stock-based		2,628	6,614
Changes in assets and liabilities, net:
Trade and other receivables		18,263	30,891
Changes in due to/from affiliate, net		25,792	53,769
Marine operating supplies		2,289	11,370
Other current assets		(1,827)	(3,681)
Accounts payable		9,671	5,228
Accrued expenses		(16,386)	(13,512)
Accrued property and liability losses		281	(212)
Other current liabilities		(9,716)	(6,011)
Other liabilities and deferred credits		(5,173)	2,594
Other, net		(1,448)	4,648
Net cash provided by (used in) operating activities		(602)	163,891
Cash flows from investing activities:
Proceeds from sales of assets		1,839	6,133
Additions to properties and equipment		(9,509)	(138,990)
Refunds from cancelled vessel construction contracts		11,515	36,190
Net cash provided by (used in) investing activities		3,845	(96,667)
Cash flows from financing activities:
Principal payment on long-term debt		(5,036)	(64,374)
Debt borrowings			31,338
Cash dividends			(23,579)
Other		(1,722)	(961)
Net cash used in financing activities		(6,758)	(57,576)
Net change in cash and cash equivalents		(3,515)	9,648
Cash and cash equivalents at beginning of period		678,438	78,568
Cash and cash equivalents at end of period		674,923	88,216
Cash paid during the period for:
Interest, net of amounts capitalized		34,209	24,894
Income taxes		16,790	27,853
Supplemental disclosure of non-cash investing activities:
Additions to properties and equipment		$ 10,477	$ 1,471

[1] Refer to Note (15) for additional information regarding asset impairment charges.