CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net loss		$ (88,643)	$ (15,164)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization		44,552	45,657
Provision for deferred income taxes			64
Gain on asset dispositions, net		(5,643)	(7,351)
Asset impairments	[1]	36,886	14,958
Equity in losses of unconsolidated companies, less dividends		108	3,143
Compensation expense - stock-based		1,536	3,219
Changes in assets and liabilities, net:
Trade and other receivables		26,414	40,280
Changes in due to/from affiliate, net		5,947	41,302
Marine operating supplies		1,288	5,250
Other current assets		(4,147)	(10,578)
Accounts payable		4,613	4,227
Accrued expenses		(19,993)	(28,772)
Accrued property and liability losses		289	(209)
Other current liabilities		(6,814)	(6,811)
Other liabilities and deferred credits		(3,212)	708
Other, net		(4,084)	2,774
Net cash provided by (used in) operating activities		(10,903)	92,697
Cash flows from investing activities:
Proceeds from sales of assets		1,234	5,176
Additions to properties and equipment		(7,578)	(92,598)
Refunds from cancelled vessel construction contracts		11,515	24,190
Net cash provided by (used in) investing activities		5,171	(63,232)
Cash flows from financing activities:
Principal payment on long-term debt		(2,324)	(23,662)
Debt borrowings			31,338
Cash dividends			(11,789)
Other		(1,722)	(936)
Net cash used in financing activities		(4,046)	(5,049)
Net change in cash and cash equivalents		(9,778)	24,416
Cash and cash equivalents at beginning of period		678,438	78,568
Cash and cash equivalents at end of period		668,660	102,984
Cash paid during the period for:
Interest, net of amounts capitalized		26,733	22,430
Income taxes		11,006	17,441
Supplemental disclosure of non-cash investing activities:
Additions to properties and equipment		$ 2,537	$ 421

[1] Refer to Note (14) for additional information regarding asset impairment charges.