CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net loss	$ (650,011)	$ (160,376)	$ (65,349)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	167,291	182,309	175,204
Provision (benefit) for deferred income taxes	(2,200)	(6,796)	(72,389)
(Gain) loss on asset dispositions, net	(24,099)	(26,037)	(23,796)
Asset impairments	484,727	117,311	14,525
Goodwill impairment			283,699
Equity in earnings (losses) of unconsolidated companies, net of dividends	(7,613)	28,704	(1,916)
Compensation expense – stock based	3,278	13,219	21,374
Excess tax (benefit) liability on stock options exercised	4,927	1,605	1,784
Changes in assets and liabilities, net:
Trade and other receivables	104,829	71,540	(43,537)
Changes in due to/from affiliate, net	20,829	84,084	108,588
Marine operating supplies	2,285	13,672	6,148
Other current assets	(12,523)	5,976	2,794
Accounts payable	(17,531)	(4,881)	(22,989)
Accrued expenses	(18,687)	(53,143)	(11,435)
Accrued property and liability losses	262	(348)	38
Other current liabilities	(26,658)	(15,578)	118
Other liabilities and deferred credits	(2,657)	231	4,875
Other, net	3,372	1,868	(19,023)
Net cash provided by operating activities	29,821	253,360	358,713
Cash flows from investing activities:
Proceeds from sales of assets	14,797	10,690	8,310
Proceeds from sale/leaseback of assets			123,950
Additions to properties and equipment	(25,499)	(194,485)	(364,194)
Refunds from cancelled vessel construction contracts	25,565	46,119
Other		2,680	516
Net cash provided by (used in) investing activities	14,863	(134,996)	(231,418)
Cash flows from financing activities:
Principal payments on long-term debt	(10,069)	(136,843)	(97,823)
Debt borrowings		656,338	138,488
Cash dividends		(35,388)	(48,834)
Repurchases of common stock			(99,999)
Other	(6,649)	(2,601)	(918)
Net cash (used in) provided by financing activities	(16,718)	481,506	(109,086)
Net change in cash and cash equivalents	27,966	599,870	18,209
Cash and cash equivalents at beginning of year	678,438	78,568	60,359
Cash and cash equivalents at end of year	706,404	678,438	78,568
Cash paid during the year for:
Interest, net of amounts capitalized	70,687	50,729	49,390
Income taxes	26,916	$ 51,585	74,310
Supplemental disclosure of noncash investing activities:
Additions to properties and equipment	$ 5,047		$ 2,068