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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Operating activities:    
Net earnings (loss) $ (59,163) $ 104,524
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities:    
Depreciation and amortization 91,636 86,819
Provision (benefit) for deferred income taxes 128 1,287
Gain on asset dispositions, net (13,462) (8,393)
Asset impairments [1] 46,630 1,860
Equity in earnings (losses) of unconsolidated companies, less dividends 6,424 (6,875)
Compensation expense - stock-based 6,614 11,075
Changes in assets and liabilities, net:    
Trade and other receivables 30,891 (24,258)
Changes in due to/from affiliate, net 53,769 62,555
Marine operating supplies 11,370 (6,139)
Other current assets (3,681) (4,052)
Accounts payable 5,228 (15,652)
Accrued expenses (13,512) (13,358)
Accrued property and liability losses (212) (393)
Other current liabilities (6,011) 450
Other liabilities and deferred credits 2,594 (1,245)
Other, net 4,648 (2,916)
Net cash provided by operating activities 163,891 185,289
Cash flows from investing activities:    
Proceeds from sales of assets 6,262 3,999
Proceeds from sale/leaseback of assets   32,751
Additions to properties and equipment (138,990) (128,411)
Refunds from cancelled vessel construction contracts 36,190  
Other (129) (13)
Net cash used in investing activities (96,667) (91,674)
Cash flows from financing activities:    
Principal payment on long-term debt (64,374) (25,996)
Debt borrowings 31,338 20,000
Proceeds from exercise of stock options   1,025
Cash dividends (23,579) (25,038)
Other (961) 350
Net cash used in financing activities (57,576) (29,659)
Net change in cash and cash equivalents 9,648 63,956
Cash and cash equivalents at beginning of period 78,568 60,359
Cash and cash equivalents at end of period 88,216 124,315
Cash paid during the period for:    
Interest, net of amounts capitalized 24,894 26,328
Income taxes 27,853 32,414
Supplemental disclosure of non-cash investing activities:    
Additions to properties and equipment $ 1,471 $ 3,845
[1] Refer to Note (15) for additional information regarding asset impairment charges.