Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Current Assets:
Cash and cash equivalents	$ 44,950	$ 26,022	$ 176,829
Accounts receivable, net	212,052	203,748	203,242
Inventories, net	333,487	322,607	331,679
Current deferred income tax benefits	79,002	80,674	88,805
Other current assets	32,453	24,799	39,806
Total Current Assets	701,944	657,850	840,361
Property, plant and equipment	3,721,378	3,688,692	3,589,883
Allowances for depreciation, depletion and amortization	(1,952,450)	(1,914,401)	(1,913,562)
Net property, plant and equipment	1,768,928	1,774,291	1,676,321
Goodwill	616,729	616,671	626,527
Other intangibles, net	53,224	54,133	17,166
Other noncurrent assets	41,292	44,877	48,231
Total Assets	3,182,117	3,147,822	3,208,606
Current Liabilities:
Bank overdraft	1,929
Accounts payable	100,082	92,210	74,914
Accrued salaries, benefits and payroll taxes	12,389	16,732	9,239
Pension and postretirement benefits	6,612	5,250	4,234
Accrued insurance and other taxes	24,025	26,408	24,326
Current maturities of long-term debt and short-term facilities	7,650	7,182	7,101
Accrued interest	18,304	7,669	26,914
Other current liabilities	14,380	18,261	12,034
Total Current Liabilities	185,371	173,712	158,762
Long-term debt	1,127,178	1,052,902	1,161,518
Pension, postretirement and postemployment benefits	156,076	158,101	129,592
Noncurrent deferred income taxes	225,554	222,064	240,586
Other noncurrent liabilities	89,656	92,179	83,402
Total Liabilities	1,783,835	1,698,958	1,773,860
Equity:
Common stock, par value $0.01 per share	456	456	455
Preferred stock, par value $0.01 per share
Additional paid-in capital	405,473	401,864	400,972
Accumulated other comprehensive loss	(81,991)	(83,890)	(54,564)
Retained earnings	1,035,739	1,090,891	1,046,346
Total Shareholders' Equity	1,359,677	1,409,321	1,393,209
Noncontrolling interests	38,605	39,543	41,537
Total Equity	1,398,282	1,448,864	1,434,746
Total Liabilities and Equity	$ 3,182,117	$ 3,147,822	$ 3,208,606