Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 95,390	$ 139,855
Accounts receivable, net of allowances of $13,705 in 2013 and $16,149 in 2012	120,789	121,147
Accounts receivable from affiliates	32,636	28,144
Inventories, net	184,445	169,440
Deferred income taxes	14,452	15,335
Prepaid expenses and other	13,578	12,921
Total current assets	461,290	486,842
Property, plant and equipment, net	219,256	182,985
Goodwill	0	6,399
Coal supply agreements and other intangibles, net	59,685	63,353
Other non-current assets	69,725	36,727
Total assets	809,956	776,306
Current liabilities
Accounts payable	133,016	127,469
Revolving credit agreements of subsidiaries — not guaranteed by the parent company	23,460	35,288
Current maturities of long-term debt of subsidiaries — not guaranteed by the parent company	7,859	6,961
Accrued income taxes	8,877	2,088
Accrued payroll	29,030	24,288
Other current liabilities	35,877	31,075
Total current liabilities	238,119	227,169
Long-term debt of subsidiaries — not guaranteed by the parent company	152,431	135,448
Mine closing reserves	29,764	29,032
Pension and other postretirement obligations	7,648	15,801
Long-term deferred income taxes	24,786	27,313
Other long-term liabilities	59,428	60,212
Total liabilities	512,176	494,975
Common stock:
Capital in excess of par value	941	24,612
Retained earnings	301,227	270,227
Accumulated other comprehensive income (loss)	(12,259)	(21,861)
Total stockholders’ equity	297,780	281,331
Total liabilities and equity	809,956	776,306
Common Class A
Common stock:
Common stock	6,290	6,771
Common Class B
Common stock:
Common stock	$ 1,581	$ 1,582