Unaudited Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 96,870	$ 139,855
Accounts receivable, net	90,240	121,147
Accounts receivable from affiliates	27,642	28,144
Inventories, net	162,234	169,440
Deferred income taxes	10,604	15,335
Prepaid expenses and other	19,272	12,921
Total Current Assets	406,862	486,842
Property, Plant and Equipment, Net	184,062	182,985
Goodwill	6,399	6,399
Coal Supply Agreement and Other Intangibles, Net	62,312	63,353
Other Non-current Assets	54,093	36,727
Total Assets	713,728	776,306
Current Liabilities
Accounts payable	90,576	127,469
Revolving credit agreements of subsidiaries - not guaranteed by the parent company	42,754	35,288
Current maturities of long-term debt of subsidiaries - not guaranteed by the parent company	6,965	6,961
Accrued payroll	13,590	24,288
Other current liabilities	27,366	33,163
Total Current Liabilities	181,251	227,169
Long-term Debt of Subsidiaries - not guaranteed by the parent company	123,839	135,448
Mine Closing Reserves	29,223	29,033
Pension and other Postretirement Obligations	23,735	24,394
Long-term Deferred Income Taxes	24,632	27,313
Other Long-term Liabilities	50,555	51,618
Total Liabilities	433,235	494,975
Common stock:
Capital in excess of par value	20,035	24,612
Retained earnings	315,770	313,450
Accumulated other comprehensive loss	(63,650)	(65,084)
Total Stockholders' Equity	280,493	281,331
Total Liabilities and Equity	713,728	776,306
Common Class A
Common stock:
Common stock	6,756	6,771
Common Class B
Common stock:
Common stock	$ 1,582	$ 1,582