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CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net earnings $ 38,484 $ 61,411
Adjustments to reconcile net earnings to net cash provided by operations:    
Depreciation and amortization 48,624 45,766
Provision for deferred income taxes 14,713 7,182
Amortization of unearned share-based compensation 2,584 2,538
Amortization of major maintenance costs 4,608 4,932
Amortization of debt issuance costs 200 635
Other (342) (1,124)
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net 2,611 (18,775)
Net cash provided by operating activities 111,482 102,565
Cash flows from investing activities:    
Capital expenditures (50,523) (96,533)
Acquisition of marine equipment 0 (41,250)
Proceeds from disposition of assets 297 10,240
Net cash used in investing activities (50,226) (127,543)
Cash flows from financing activities:    
Borrowings (payments) on bank credit facilities, net (62,886) 102,200
Proceeds from exercise of stock options 0 375
Purchase of treasury stock (1,827) (98,011)
Excess tax benefit from equity compensation plans 0 1,015
Other (711) (409)
Net cash provided by (used in) financing activities (65,424) 5,170
Decrease in cash and cash equivalents (4,168) (19,808)
Cash and cash equivalents, beginning of year 5,885 24,299
Cash and cash equivalents, end of period 1,717 4,491
Supplemental disclosures of cash flow information:    
Interest paid 8,743 9,190
Income taxes paid (refunded) (412) 140
Capital expenditures included in accounts payable $ (987) $ 0