CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Current Assets:
Cash and cash equivalents	$ 37,260	$ 25,394	$ 44,950
Accounts receivable, net	202,150	224,050	212,052
Inventories, net	347,641	332,311	333,487
Current deferred income tax benefits	79,485	77,716	79,002
Other current assets	49,197	40,930	32,453
Total Current Assets	715,733	700,401	701,944
Property, plant and equipment	3,824,638	3,812,587	3,721,378
Allowances for depreciation, depletion and amortization	(2,092,551)	(2,059,346)	(1,952,450)
Net property, plant and equipment	1,732,087	1,753,241	1,768,928
Goodwill	616,350	616,204	616,729
Other intangibles, net	49,548	50,433	53,224
Other noncurrent assets	41,057	40,647	41,292
Total Assets	3,154,775	3,160,926	3,182,117
Current Liabilities:
Bank overdraft			1,929
Accounts payable	77,080	83,537	100,082
Accrued salaries, benefits and payroll taxes	12,387	19,461	12,389
Pension and postretirement benefits	4,091	6,851	6,612
Accrued insurance and other taxes	27,470	28,682	24,025
Current maturities of long-term debt and short-term facilities	5,677	5,676	7,650
Accrued interest	18,479	7,490	18,304
Other current liabilities	23,506	21,638	14,380
Total Current Liabilities	168,690	173,335	185,371
Long-term debt	1,072,850	1,042,183	1,127,178
Pension, postretirement and postemployment benefits	184,287	183,122	156,076
Noncurrent deferred income taxes	230,109	225,592	225,554
Other noncurrent liabilities	88,782	86,395	89,656
Total Liabilities	1,744,718	1,710,627	1,783,835
Equity:
Common stock, par value $0.01 per share	459	459	456
Preferred stock, par value $0.01 per share
Additional paid-in capital	421,024	414,657	405,473
Accumulated other comprehensive loss	(104,948)	(106,169)	(81,991)
Retained earnings	1,055,256	1,101,598	1,035,739
Total Shareholders' Equity	1,371,791	1,410,545	1,359,677
Noncontrolling interests	38,266	39,754	38,605
Total Equity	1,410,057	1,450,299	1,398,282
Total Liabilities and Equity	$ 3,154,775	$ 3,160,926	$ 3,182,117