Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 61,135	$ 95,390
Accounts receivable, net of allowances of $17,327 in 2014 and $13,705 in 2013	123,466	120,789
Accounts receivable from affiliates	57,421	32,636
Inventories, net	190,382	184,445
Deferred income taxes	18,566	14,452
Prepaid expenses and other	14,743	13,578
Total current assets	465,713	461,290
Property, plant and equipment, net	159,644	219,256
Goodwill	6,253	0
Other intangibles, net	60,821	59,685
Deferred income taxes	15,806	595
Other non-current assets	62,283	69,130
Total assets	770,520	809,956
Current liabilities
Accounts payable	133,668	133,016
Revolving credit agreements of subsidiaries — not guaranteed by the parent company	55,000	23,460
Current maturities of long-term debt of subsidiaries — not guaranteed by the parent company	1,467	7,859
Accrued income taxes	4,015	8,877
Accrued payroll	23,567	29,030
Other current liabilities	36,964	35,877
Total current liabilities	254,681	238,119
Long-term debt of subsidiaries — not guaranteed by the parent company	191,431	152,431
Mine closing reserves	37,399	29,764
Pension and other postretirement obligations	10,616	7,648
Deferred income taxes	0	24,786
Other long-term liabilities	64,919	59,428
Total liabilities	559,046	512,176
Common stock:
Capital in excess of par value	0	0
Retained earnings	224,428	302,168
Accumulated other comprehensive income (loss)	(20,189)	(12,259)
Total stockholders’ equity	211,474	297,780
Total liabilities and equity	770,520	809,956
Shares Outstanding Class A
Common stock:
Common stock	5,662	6,290
Shares Outstanding Class B
Common stock:
Common stock	$ 1,573	$ 1,581