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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net earnings $ 142,804 $ 227,970 $ 284,608
Adjustments to reconcile net earnings to net cash provided by operations:      
Depreciation and amortization 200,917 192,240 169,312
Provision (credit) for doubtful accounts (467) 1,426 3,577
Provision for deferred income taxes 51,296 62,755 77,976
Loss (gain) on disposition of assets 127 (1,672) (781)
Equity in earnings of affiliates, net of distributions and contributions (532) 449 (384)
Amortization of unearned share-based compensation 11,675 11,104 11,591
Amortization of major maintenance costs 19,869 22,126 16,409
Amortization of debt issuance costs 801 1,377 2,362
Increase (decrease) in cash flows resulting from changes in:      
Accounts receivable (12,750) 129,908 (176,544)
Inventory 3,182 (7,320) (56,468)
Other assets (30,853) (15,551) (14,145)
Income taxes payable 15,413 477 (4,544)
Accounts payable (1,739) (81,808) 44,645
Accrued and other liabilities 14,295 (22,176) 81,295
Net cash provided by operating activities 414,038 521,305 438,909
Cash flows from investing activities:      
Capital expenditures (231,066) (345,475) (355,144)
Acquisitions of businesses and marine equipment (137,072) (41,250) (31,800)
Proceeds from disposition of assets 18,617 24,429 10,393
Net cash used in investing activities (349,521) (362,296) (376,551)
Cash flows from financing activities:      
Borrowings (payments) on bank credit facilities, net (52,848) 160,784 75,550
Payments on long-term debt 0 (100,000) (108,000)
Return of investment to noncontrolling interests (1,976) (1,778) (3,192)
Proceeds from exercise of stock options 321 3,712 7,519
Purchase of treasury stock (1,827) (241,105) (15,321)
Payment of contingent liability 0 0 (4,756)
Acquisition of noncontrolling interest (8,438) 0 0
Excess tax benefit from equity compensation plans 0 964 6,119
Net cash used in financing activities (64,768) (177,423) (42,081)
Increase (decrease) in cash and cash equivalents (251) (18,414) 20,277
Cash and cash equivalents, beginning of year 5,885 24,299 4,022
Cash and cash equivalents, end of year 5,634 5,885 24,299
Supplemental disclosures of cash flow information:      
Interest paid 19,878 20,586 19,622
Income taxes paid 18,162 69,584 90,460
Capital expenditures included in accounts payable (2,037) 2,206 0
Fair value of property transferred in acquisition $ 3,681 $ 0 $ 0