Unaudited Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
ASSETS
Cash and cash equivalents	$ 79,353	$ 139,855	$ 155,714
Accounts receivable, net	107,630	121,147	104,489
Accounts receivable from affiliates	30,551	28,144	3,242
Inventories, net	207,349	169,440	205,355
Deferred income taxes	14,428	15,335	23,930
Prepaid expenses and other	15,644	12,921	16,411
Total current assets	454,955	486,842	509,141
Property, plant and equipment, net	193,864	182,985	193,544
Goodwill	3,973	6,399	7,456
Coal supply agreements and other intangibles, net	60,617	63,353	71,884
Other non-current assets	64,680	36,727	39,992
Total assets	778,089	776,306	822,017
LIABILITIES AND EQUITY
Accounts payable	141,919	127,469	134,401
Revolving credit agreements of subsidiaries - not guaranteed by the parent company	37,812	35,288	41,955
Current maturities of long-term debt of subsidiaries - not guaranteed by the parent company	7,850	6,961	6,957
Accrued payroll	22,469	24,288	18,002
Other current liabilities	40,418	33,163	42,524
Total current liabilities	250,468	227,169	243,839
Long-term debt of subsidiaries - not guaranteed by the parent company	129,123	135,448	158,404
Mine closing reserves	29,212	29,033	29,773
Pension and other postretirement obligations	15,466	24,394	24,491
Long-term deferred income taxes	23,074	27,313	23,995
Other long-term liabilities	55,025	51,618	50,369
Total liabilities	502,368	494,975	530,871
Common stock:
Capital in excess of par value	367	24,612	24,946
Retained earnings	327,746	313,450	321,297
Accumulated other comprehensive loss	(60,330)	(65,084)	(63,491)
Total stockholders' equity	275,721	281,331	291,146
Total liabilities and equity	778,089	776,306	822,017
Common Class A
Common stock:
Common stock	6,357	6,771	6,804
Common Class B
Common stock:
Common stock	$ 1,581	$ 1,582	$ 1,590