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CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net earnings $ 77,593 $ 119,787
Adjustments to reconcile net earnings to net cash provided by operations:    
Depreciation and amortization 98,285 92,591
Provision for deferred income taxes 29,682 13,801
Amortization of unearned share-based compensation 5,545 5,251
Amortization of major maintenance costs 9,295 10,360
Amortization of debt issuance costs 401 977
Other (661) 70
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net (10,273) 3,081
Net cash provided by operating activities 209,867 245,918
Cash flows from investing activities:    
Capital expenditures (111,048) (190,152)
Acquisitions of businesses and marine equipment (120,991) (41,250)
Proceeds from disposition of assets 3,147 10,636
Net cash used in investing activities (228,892) (220,766)
Cash flows from financing activities:    
Borrowings on bank credit facilities, net 23,438 190,321
Payments on long-term debt 0 (100,000)
Proceeds from exercise of stock options 321 3,712
Purchase of treasury stock (1,827) (138,851)
Acquisition of noncontrolling interest (4,160) 0
Excess tax benefit from equity compensation plans 0 1,064
Other (1,773) (708)
Net cash provided by (used in) financing activities 15,999 (44,462)
Decrease in cash and cash equivalents (3,026) (19,310)
Cash and cash equivalents, beginning of year 5,885 24,299
Cash and cash equivalents, end of period 2,859 4,989
Supplemental disclosures of cash flow information:    
Interest paid 9,823 10,550
Income taxes paid 14,519 45,360
Capital expenditures included in accounts payable (9,769) 0
Fair value of property transferred in acquisition $ 3,681 $ 0