CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net earnings	$ 119,787	$ 138,922
Adjustments to reconcile net earnings to net cash provided by operations:
Depreciation and amortization	92,591	82,443
Provision for deferred income taxes	13,801	14,413
Amortization of unearned share-based compensation	5,251	5,273
Amortization of major maintenance costs	10,360	7,713
Other	70	(574)
Increase in cash flows resulting from changes in operating assets and liabilities, net	4,058	3,218
Net cash provided by operating activities	245,918	251,408
Cash flows from investing activities:
Capital expenditures	(190,152)	(163,299)
Acquisition of marine equipment	(41,250)	0
Proceeds from disposition of assets	10,636	3,884
Net cash used in investing activities	(220,766)	(159,415)
Cash flows from financing activities:
Borrowings (payments) on bank credit facilities, net	190,321	(33,850)
Payments on long-term debt	(100,000)	(66,000)
Proceeds from exercise of stock options	3,712	7,275
Purchase of treasury stock	(138,851)	0
Payment of contingent liability	0	(4,756)
Excess tax benefit from equity compensation plans	1,064	6,155
Other	(708)	(1,905)
Net cash used in financing activities	(44,462)	(93,081)
Decrease in cash and cash equivalents	(19,310)	(1,088)
Cash and cash equivalents, beginning of year	24,299	4,022
Cash and cash equivalents, end of period	4,989	2,934
Cash paid during the period:
Interest	10,550	9,960
Income taxes	$ 45,360	$ 58,632