Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenues	$ 135,375	$ 104,778
Cost of sales	105,407	87,859
Gross profit	29,968	16,919
Earnings of unconsolidated operations	64,994	61,361
Operating expenses
Selling, general and administrative expenses	49,192	47,491
Centennial asset impairment charge	0	982
Amortization of intangible assets	3,038	2,123
Gain on sale of assets	(892)	(5,130)
Operating Expenses	51,338	45,466
Operating profit	43,624	32,814
Other expense (income)
Interest expense	1,998	3,440
Income from other unconsolidated affiliates	(1,276)	(1,246)
Closed mine obligations	1,297	1,590
Other, net, including interest income	(558)	(72)
Other (income) expense	1,461	3,712
Income from continuing operations before income tax provision	42,163	29,102
Income tax provision from continuing operations	7,378	639
Income from continuing operations	34,785	28,463
Discontinued operations, net of tax expense of $2,162 in 2017	0	1,874
Net income	$ 34,785	$ 30,337
Basic earnings per share:
Continuing operations (USD per share)	$ 5.02	$ 4.17
Discontinued operations (USD per share)	0.00	0.27
Basic earnings per share (USD per share)	5.02	4.44
Diluted earnings per share:
Continuing operations (USD per share)	5.00	4.14
Discontinued operations (USD per share)	0.00	0.27
Diluted earnings per share (USD per share)	$ 5.00	$ 4.41
Basic weighted average shares outstanding (in shares)	6,924	6,830
Diluted weighted average shares outstanding (in shares)	6,960	6,873
Revenue - consolidated mines
Revenues	$ 117,869	$ 92,008
Cost of sales	102,922	85,657
Revenue - royalty and other
Revenues	17,506	12,770
Cost of sales	$ 2,485	$ 2,202