CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net income	$ 142,281	$ 265,692	$ 129,599
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	225,216	222,607	224,698
Impairment charges	8,250		12,805
Equity-based compensation	12,481	17,283	14,688
Deferred income taxes	54,528	34,436	46,097
(Gain) loss on disposal of property, plant and equipment	509	(3,925)	1,215
Changes in certain assets and liabilities:
Accounts receivable	85,977	(100,602)	(196,556)
Inventories	13,845	(85,523)	(261,110)
Other assets	(1,337)	5,683	(15,335)
Accounts payable	(32,593)	56,551	71,169
Income taxes receivable/payable	21,644	26,242	99,276
Accrued expenses	(85,107)	47,911	42,761
Net cash provided by operating activities	445,694	486,355	169,307
Investing activities:
Purchases of property, plant and equipment	(223,525)	(167,007)	(133,394)
Proceeds from maturities of (investments in) short-term commercial paper, net	53,310	(84,830)
Other investing activities	(21,386)	16,000	(15,684)
Net cash used in investing activities	(191,601)	(235,837)	(149,078)
Financing activities:
Issuance of current and long-term debt	1,049,969	10,103	556,553
Repayments of current and long-term debt	(1,258,842)	(7,740)	(346,963)
Proceeds from exercise of stock options, including related tax effect	3,662	13,396	14,014
Contributions from noncontrolling investors	37,959	27,389	5,348
Distributions to noncontrolling investor	(151)	(567)
Dividends paid	(87,633)	(81,882)	(64,969)
Debt issuance costs	(13,901)	(6,969)	(6,707)
Net cash provided by (used in) financing activities	(268,937)	(46,270)	157,276
Increase (decrease) in cash and equivalents	(14,844)	204,248	177,505
Cash and equivalents at beginning of year	390,761	186,513	9,008
Cash and equivalents at end of year	$ 375,917	$ 390,761	$ 186,513