CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net earnings	$ 216,135	$ 191,040
Adjustments to reconcile net earnings to net cash provided by operations:
Depreciation and amortization	124,876	122,907
Provision for deferred income taxes	30,727	68,523
Amortization of unearned share-based compensation	8,824	8,921
Other	11,338	5,656
Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net	(66,335)	53,668
Net cash provided by operating activities	325,565	450,715
Cash flows from investing activities:
Capital expenditures	(234,098)	(207,047)
Acquisition of businesses and marine equipment	(6,500)	(3,643)
Proceeds from disposition of assets	8,139	30,390
Net cash used in investing activities	(232,459)	(180,300)
Cash flows from financing activities:
Borrowings on bank credit facilities, net	8,200	(143,180)
Borrowings on long-term debt	0	225,000
Payments on long-term debt	(108,000)	(356,000)
Proceeds from exercise of stock options	7,410	4,328
Payment of contingent liability	(4,756)	(5,000)
Excess tax benefit from equity compensation plans	6,136	2,824
Other	(2,434)	(2,964)
Net cash used in financing activities	(93,444)	(274,992)
Decrease in cash and cash equivalents	(338)	(4,577)
Cash and cash equivalents, beginning of year	4,022	11,059
Cash and cash equivalents, end of period	3,684	6,482
Cash paid during the period:
Interest	18,375	19,921
Income taxes	$ 84,983	$ 23,000