CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net loss		$ (524,410)	$ (88,643)
Adjustments to reconcile net loss to net cash provided by operating activities:
Reorganization items		308,011
Depreciation and amortization		36,287	44,552
Provision for deferred income taxes		(5,543)
Gain on asset dispositions, net		(3,189)	(5,643)
Asset impairments	[1]	163,423	36,886
Equity in earnings (losses) of unconsolidated companies, less dividends		(4,101)	108
Compensation expense - stock-based		326	1,536
Changes in assets and liabilities, net:
Trade and other receivables		6,650	26,414
Changes in due to/from affiliate, net		(1,978)	5,947
Marine operating supplies		(514)	1,288
Other current assets		(16,210)	(4,147)
Accounts payable		3,488	4,613
Accrued expenses		8,603	(19,993)
Accrued property and liability losses		(825)	289
Other current liabilities		2,644	(6,814)
Other liabilities and deferred credits		1,251	(3,212)
Other, net		2,724	(4,084)
Net cash used in operating activities		(23,363)	(10,903)
Cash flows from investing activities:
Proceeds from sales of assets		608	1,234
Additions to properties and equipment		(1,627)	(7,578)
Payments related to novated vessel construction contract		5,272
Refunds from cancelled vessel construction contracts			11,515
Net cash provided by investing activities		4,253	5,171
Cash flows from financing activities:
Principal payment on long-term debt		(2,316)	(2,324)
Other		(1,200)	(1,722)
Net cash used in financing activities		(3,516)	(4,046)
Net change in cash and cash equivalents		(22,626)	(9,778)
Cash and cash equivalents at beginning of period		706,404	678,438
Cash and cash equivalents at end of period		683,778	668,660
Cash paid during the period for:
Interest, net of amounts capitalized		433	26,733
Income taxes		$ 3,611	11,006
Supplemental disclosure of non-cash investing activities:
Additions to properties and equipment			$ 2,537

[1] Refer to Note (16) for additional information regarding asset impairment charges.