CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating activities:
Net income	$ 51,090	$ 6,105	$ 115,615	$ 87,187
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	58,202	58,953	172,089	170,027
Equity-based compensation	2,515	738	9,612	9,463
Impairment charges		7,894	308	7,894
Deferred income taxes	9,861	34,633	31,608	54,464
(Gain) loss on disposal of property, plant and equipment	1,739	(152)	944	(565)
Changes in certain assets and liabilities:
Accounts receivable	254	2,690	(130,510)	15,604
Inventories	(23,648)	43,005	10,360	6,702
Other assets	(1,727)	(7,484)	8,414	(4,917)
Accounts payable	59,801	6,920	52,419	(19,015)
Income taxes receivable/payable	16,354	25,993	(9,972)	16,917
Accrued expenses and liabilities	8,825	(61,929)	(15,196)	(104,375)
Net cash provided by operating activities	183,266	117,366	245,691	239,386
Investing activities:
Purchases of property, plant and equipment	(52,162)	(58,342)	(146,744)	(158,686)
Proceeds from maturity of short-term commercial paper		9,998	31,520	84,830
Other investing activities	844	655	4,121	(20,379)
Net cash used in investing activities	(51,318)	(47,689)	(111,103)	(94,235)
Financing activities:
Issuance of current and long-term debt	9,526	760,000	418,819	1,049,969
Repayment of current and long-term debt	(4,097)	(946,858)	(512,100)	(1,252,202)
Debt issuance costs		(11,625)	(6,192)	(13,813)
Proceeds from exercise of stock options, including related tax effect	7,925	583	18,516	2,021
Contributions from noncontrolling investors, net	5,275	16,320	10,972	30,943
Dividends paid	(24,274)	(21,915)	(70,464)	(65,710)
Net cash used in financing activities	(5,645)	(203,495)	(140,449)	(248,792)
Increase (decrease) in cash and equivalents	126,303	(133,818)	(5,861)	(103,641)
Cash and equivalents at beginning of period	243,753	420,938	375,917	390,761
Cash and equivalents at end of period	370,056	287,120	370,056	287,120
Supplemental disclosure information:
Cash paid for interest	40,075	42,413	107,390	123,973
Cash paid for federal and state income taxes, net	$ 3,022	$ 3,629	$ 41,547	$ 43,976