Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 191,691	$ 202,121
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	494,801	462,627
Loss on early extinguishment of debt		884
Deferred income taxes	(15,767)	113,207
Stock based and performance share unit compensation expense	32,899	26,788
Amortization of debt acquisition costs and note discount	6,126	6,819
Other reconciling items, net	(20,884)	(6,562)
Changes in operating assets and liabilities, net of acquisitions and dispositions:
Accounts receivable	(60,611)	140
Inventory and other current assets	29,495	(54,924)
Accounts payable	30,198	7,085
Accrued expenses	36,802	24,721
Income taxes	43,214	(183,420)
Other, net	(3,653)	36,627
Net Cash Provided by (Used in) Operating Activities, Total	764,311	636,113
Cash flows from investing activities:
Payments for capital expenditures	(438,349)	(466,831)
Proceeds from Sale of Available-for-sale Securities, Equity	10,622
Acquisitions of businesses, net of cash acquired	(2,380)	(23,797)
Other	20,575	2,709
Net Cash Provided by (Used in) Investing Activities, Total	(409,532)	(465,269)
Proceeds from Insurance Settlement, Investing Activities		22,650
Cash flows from financing activities:
Principal payments of long-term debt	(15,000)	(165,000)
Payments of Ordinary Dividends, Common Stock	37,586
Proceeds from exercise of stock options	10,554	5,551
Payments for purchase and retirement of Common Stock	(185,552)
Other	(89)	(9,924)
Net Cash Provided by (Used in) Financing Activities, Total	(227,673)	(169,373)
Repayments of Long-term Lines of Credit	(14,736)	(561,771)
Proceeds from Long-term Lines of Credit	14,736	561,771
Effect of exchange rate changes on cash	(3,111)	(2,019)
Net increase in cash and cash equivalents	123,995	(548)
Cash and cash equivalents at beginning of period	196,047	91,199
Cash and cash equivalents at end of period	$ 320,042	$ 90,651