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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Operating activities:    
Net earnings $ 43,699 $ 30,083
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 43,111 40,108
Provision (benefit) for deferred income taxes 2,432 (12,151)
Gain on asset dispositions, net (2,943) (2,140)
Equity in earnings of unconsolidated companies, less dividends (3,998) (3,398)
Compensation expense - stock-based 5,341 5,711
Excess tax benefit on stock options exercised   (12)
Changes in assets and liabilities, net:    
Trade and other receivables (39,044) 18,891
Changes in due to/from affiliate, net 31,552 (48,515)
Marine operating supplies (5,822) 1,100
Other current assets (12,534) (11,589)
Accounts payable (5,360) (11,459)
Accrued expenses (25,590) (8,421)
Accrued property and liability losses (367) 158
Other current liabilities (616) 944
Other liabilities and deferred credits 817 876
Other, net 267 3,409
Net cash provided by operating activities 30,945 3,595
Cash flows from investing activities:    
Proceeds from sales of assets 3,754 2,161
Proceeds from sale/leaseback of assets 13,400  
Additions to properties and equipment (39,874) (156,434)
Payments for acquisition, net of cash acquired   (127,737)
Other 3 (665)
Net cash used in investing activities (22,717) (282,675)
Cash flows from financing activities:    
Debt issuance costs   (2,699)
Principal payment on long-term debt (3,959) (97,490)
Debt borrowings   414,262
Proceeds from exercise of stock options 994 1,675
Cash dividends (12,520) (12,436)
Excess tax benefit on stock options exercised   12
Other 349  
Net cash (used in) provided by financing activities (15,136) 303,324
Net change in cash and cash equivalents (6,908) 24,244
Cash and cash equivalents at beginning of period 60,359 40,569
Cash and cash equivalents at end of period 53,451 64,813
Cash paid during the period for:    
Interest, net of amounts capitalized 24,385 3,980
Income taxes 11,170 20,617
Supplemental disclosure of non-cash investing activities:    
Additions to properties and equipment 5,236 130
Increase in receivables due to sale of shipyard   $ 9,500