Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Current Assets:
Cash and cash equivalents	$ 28,596	$ 168,409	$ 44,169
Accounts receivable, net	534,459	410,921	497,468
Inventories, net	504,877	469,141	479,856
Assets held for sale			426,495
Other current assets	53,997	33,164	82,134
Total Current Assets	1,121,929	1,081,635	1,530,122
Property, plant and equipment	5,896,512	5,613,198	5,421,449
Allowances for depreciation, depletion and amortization	(2,574,307)	(2,457,198)	(2,371,926)
Net property, plant and equipment	3,322,205	3,156,000	3,049,523
Goodwill	2,136,783	2,068,235	2,065,882
Operating permits, net	442,349	444,725	447,702
Other intangibles, net	64,327	65,827	67,242
Other noncurrent assets	145,712	141,189	99,926
Total Assets	7,233,305	6,957,611	7,260,397
Current Liabilities:
Bank overdraft	7,143	10,235
Accounts payable	197,733	164,718	201,235
Accrued salaries, benefits and payroll taxes	24,864	30,939	27,590
Pension and postretirement benefits	9,120	8,168	8,133
Accrued insurance and other taxes	62,525	62,781	57,078
Current maturities of long-term debt and short-term facilities	238,155	18,713	15,433
Accrued interest	16,573	16,156	16,165
Other current liabilities	45,491	54,948	37,667
Total Current Liabilities	601,604	366,658	363,301
Long-term debt	1,541,062	1,550,061	1,637,905
Pension, postretirement and postemployment benefits	236,562	224,538	272,461
Deferred income taxes, net	639,776	583,459	521,932
Other noncurrent liabilities	197,801	172,718	154,365
Total Liabilities	3,216,805	2,897,434	2,949,964
Equity:
Common stock, par value $0.01 per share	633	643	668
Preferred stock, par value $0.01 per share
Additional paid-in capital	3,318,859	3,287,827	3,274,098
Accumulated other comprehensive loss	(106,068)	(105,622)	(112,814)
Retained earnings	800,028	874,436	1,146,821
Total Shareholders' Equity	4,013,452	4,057,284	4,308,773
Noncontrolling interests	3,048	2,893	1,660
Total Equity	4,016,500	4,060,177	4,310,433
Total Liabilities and Equity	$ 7,233,305	$ 6,957,611	$ 7,260,397