Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Current Assets:
Cash and cash equivalents	$ 60,684	$ 168,409	$ 436,429
Accounts receivable, net	566,425	410,921	577,424
Inventories, net	508,199	469,141	464,525
Other current assets	56,217	33,164	37,427
Total Current Assets	1,191,525	1,081,635	1,515,805
Property, plant and equipment	6,013,084	5,613,198	5,488,744
Allowances for depreciation, depletion and amortization	(2,633,471)	(2,457,198)	(2,415,210)
Net property, plant and equipment	3,379,613	3,156,000	3,073,534
Goodwill	2,160,605	2,068,235	2,065,644
Operating permits, net	444,123	444,725	445,855
Other intangibles, net	70,927	65,827	65,556
Other noncurrent assets	126,408	141,189	142,040
Total Assets	7,373,201	6,957,611	7,308,434
Current Liabilities:
Bank overdraft		10,235
Accounts payable	192,738	164,718	226,837
Accrued salaries, benefits and payroll taxes	33,463	30,939	30,529
Pension and postretirement benefits	9,658	8,168	8,359
Accrued insurance and other taxes	67,822	62,781	70,509
Current maturities of long-term debt and short-term facilities	228,025	18,713	147,003
Accrued interest	23,060	16,156	22,414
Other current liabilities	50,143	54,948	69,208
Total Current Liabilities	604,909	366,658	574,859
Long-term debt	1,536,810	1,550,061	1,553,768
Pension, postretirement and postemployment benefits	200,152	224,538	229,042
Deferred income taxes, net	676,144	583,459	540,079
Other noncurrent liabilities	196,788	172,718	158,106
Total Liabilities	3,214,803	2,897,434	3,055,854
Equity:
Common stock, par value $0.01 per share	633	643	660
Preferred stock, par value $0.01 per share
Additional paid-in capital	3,326,531	3,287,827	3,283,200
Accumulated other comprehensive loss	(104,511)	(105,622)	(112,742)
Retained earnings	932,679	874,436	1,079,764
Total Shareholders' Equity	4,155,332	4,057,284	4,250,882
Noncontrolling interests	3,066	2,893	1,698
Total Equity	4,158,398	4,060,177	4,252,580
Total Liabilities and Equity	$ 7,373,201	$ 6,957,611	$ 7,308,434