CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities:
Net income (loss)	$ 265,692	$ 129,599	$ (11,019)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	222,607	224,698	221,426
Impairment charges		12,805
Equity-based compensation	17,283	14,688	17,589
Deferred income taxes	34,436	46,097	92,596
(Gain) loss on disposal of property, plant and equipment	(3,925)	1,215	839
Changes in certain assets and liabilities:
Accounts receivable	(100,602)	(196,556)	72,159
Inventories	(85,523)	(261,110)	175,183
Other assets	5,683	(15,335)	4,076
Accounts payable	56,551	71,169	(8,860)
Income taxes receivable/payable	26,242	99,276	1,611
Accrued expenses	47,911	42,761	(120,044)
Net cash provided by operating activities	486,355	169,307	445,556
Investing activities:
Purchases of property, plant and equipment	(167,007)	(133,394)	(330,052)
Investments in short-term commercial paper	(84,830)
Investment in direct financing lease			(27,967)
Other investing activities	16,000	(15,684)	(15,926)
Net cash used in investing activities	(235,837)	(149,078)	(373,945)
Financing activities:
Issuance of current and long-term debt	10,103	556,553	1,268,435
Repayments of current and long-term debt	(7,740)	(346,963)	(1,690,557)
Issuance of common stock (net of expenses) and proceeds from exercise of stock options, including related tax effect	13,396	14,014	420,930
Contributions from noncontrolling investors	27,389	5,348	5,000
Distributions to noncontrolling investor	(567)
Dividends paid	(81,882)	(64,969)	(68,672)
Debt issuance costs	(6,969)	(6,707)	(13,972)
Net cash provided by (used in) financing activities	(46,270)	157,276	(78,836)
Increase (decrease) in cash and equivalents	204,248	177,505	(7,225)
Cash and equivalents at beginning of year	186,513	9,008	16,233
Cash and equivalents at end of year	$ 390,761	$ 186,513	$ 9,008