CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net earnings	$ 176,898	$ 216,135
Adjustments to reconcile net earnings to net cash provided by operations:
Depreciation and amortization	142,350	124,876
Provision for deferred income taxes	19,722	30,727
Amortization of unearned share-based compensation	8,378	8,824
Amortization of major maintenance costs	17,160	11,874
Other	844	(536)
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net	12,117	(66,335)
Net cash provided by operating activities	377,469	325,565
Cash flows from investing activities:
Capital expenditures	(265,202)	(234,098)
Acquisitions of marine equipment	(41,250)	(6,500)
Proceeds from disposition of assets	13,102	8,139
Net cash used in investing activities	(293,350)	(232,459)
Cash flows from financing activities:
Borrowings on bank credit facilities, net	192,398	8,200
Payments on long-term debt	(100,000)	(108,000)
Proceeds from exercise of stock options	3,712	7,410
Purchase of treasury stock	(202,155)	0
Payment of contingent liability	0	(4,756)
Excess tax benefit from equity compensation plans	1,015	6,136
Other	(873)	(2,434)
Net cash used in financing activities	(105,903)	(93,444)
Decrease in cash and cash equivalents	(21,784)	(338)
Cash and cash equivalents, beginning of year	24,299	4,022
Cash and cash equivalents, end of period	2,515	3,684
Cash paid during the period:
Interest	19,476	18,375
Income taxes	$ 68,952	$ 84,983