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CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net earnings $ 53,617 $ 77,593
Adjustments to reconcile net earnings to net cash provided by operations:    
Depreciation and amortization 96,463 98,285
Provision for deferred income taxes 18,651 29,682
Amortization of unearned share-based compensation 5,924 5,545
Amortization of major maintenance costs 9,938 9,295
Amortization of debt issuance costs 588 401
Other 29 (661)
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net 8,585 (8,523)
Net cash provided by operating activities 193,795 211,617
Cash flows from investing activities:    
Capital expenditures (92,509) (111,048)
Acquisitions of businesses and marine equipment 0 (120,991)
Proceeds from disposition of assets 27,966 3,147
Net cash used in investing activities (64,543) (228,892)
Cash flows from financing activities:    
Borrowings (payments) on bank credit facilities, net (131,855) 23,438
Proceeds from exercise of stock options 1,838 321
Purchase of treasury stock 0 (1,827)
Acquisition of noncontrolling interests (7) (4,160)
Payments related to tax withholding for share-based compensation (2,874) (1,750)
Other (411) (1,773)
Net cash provided by (used in) financing activities (133,309) 14,249
Decrease in cash and cash equivalents (4,057) (3,026)
Cash and cash equivalents, beginning of year 5,634 5,885
Cash and cash equivalents, end of period 1,577 2,859
Supplemental disclosures of cash flow information:    
Interest paid 9,724 9,823
Income taxes paid 16,274 14,519
Capital expenditures included in accounts payable 6,289 (9,769)
Fair value of property transferred in acquisition $ 0 $ 3,681