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CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net earnings $ 138,922 $ 121,344
Adjustments to reconcile net earnings to net cash provided by operations:    
Depreciation and amortization 82,443 81,267
Provision for deferred income taxes 14,413 47,883
Amortization of unearned share-based compensation 5,273 5,061
Other 7,139 3,475
Decrease in cash flows resulting from changes in operating assets and liabilities, net 3,218 10,245
Net cash provided by operating activities 251,408 269,275
Cash flows from investing activities:    
Capital expenditures (163,299) (168,175)
Acquisition of businesses and marine equipment 0 (3,643)
Proceeds from disposition of assets 3,884 13,111
Net cash used in investing activities (159,415) (158,707)
Cash flows from financing activities:    
Payments on bank credit facilities, net (33,850) (112,870)
Borrowings on long-term debt 0 225,000
Payments on long-term debt (66,000) (226,000)
Proceeds from exercise of stock options 7,275 2,573
Payment of contingent liability (4,756) (5,000)
Excess tax benefit from equity compensation plans 6,155 2,253
Other (1,905) (2,320)
Net cash used in financing activities (93,081) (116,364)
Decrease in cash and cash equivalents (1,088) (5,796)
Cash and cash equivalents, beginning of year 4,022 11,059
Cash and cash equivalents, end of period 2,934 5,263
Cash paid (received) during the period:    
Interest 9,960 8,012
Income taxes $ 58,632 $ 17,969