CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income (loss)	$ 115,189	$ 100,473
Adjustments to net income (loss):
Depreciation and amortization	564,947	543,637
Depletion and other oil and gas expense	1,511	14,182
Deferred income tax expense (benefit)	3,172	(20,720)
Impairment and other charges		45,000
Losses (gains) on long-lived assets, net	15,041	(10,017)
Losses (gains) on investments, net	(5,062)	(91,140)
Share-based compensation	19,301	38,824
Foreign currency transaction losses (gains), net	1,044	7,311
Equity in (earnings) losses of unconsolidated affiliates, net of dividends	3,021	(3,891)
Other	3,355	9,709
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(48,089)	22,556
Inventory	(6,623)	13,893
Other current assets	(31,780)	(3,402)
Other long-term assets	10,868	25,820
Trade accounts payable and accrued liabilities	57,418	38,216
Income taxes payable	(63,070)	(28,834)
Other long-term liabilities	205,794	(36,209)
Net cash provided by operating activities	846,037	665,408
Cash flows from investing activities:
Purchases of investments	(266)
Sales and maturities of investments	23,238	163,161
Proceeds from sales of unconsolidated affiliate		10,000
Cash paid for acquisition of businesses, net	(10,200)	(37,516)
Investment in unconsolidated affiliates	(1,612)	(3,927)
Capital expenditures	(862,680)	(500,368)
Proceeds from sales of assets and insurance claims	69,343	29,731
Other	(761)	(3,142)
Net cash used for investing activities	(782,938)	(342,061)
Cash flows from financing activities:
Increase (decrease) in cash overdrafts	(3,383)	(8,686)
Proceeds from (payments for) issuance of common shares	29,047	3,200
Dividends to shareholders	(23,792)	(23,552)
Proceeds from debt		11,569
Debt issuance costs		(87)
Reduction in long-term debt	(75,000)	(17,853)
Reduction in short-term debt	(10,000)
Proceeds from (payment for) commercial paper, net	111,228	295,000
Purchase of preferred stock	(70,875)
Proceeds from revolving credit facilities	15,000
Reduction in revolving credit facilities		(590,000)
Other	(7,303)	(3,023)
Net cash used for financing activities	(35,078)	(333,432)
Effect of exchange rate changes on cash and cash equivalents	(6,978)	(6,709)
Net increase (decrease) in cash and cash equivalents	21,043	(16,794)
Cash and cash equivalents, beginning of period	389,915	524,922
Cash and cash equivalents, end of period	$ 410,958	$ 508,128