Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 83,050	$ 101,600
Trade accounts receivable, net	12,955	14,611
Accounts receivable from affiliates	11,517	19,919
Inventories, net	33,182	30,015
Prepaid expenses and other	10,762	10,843
Total current assets	151,466	176,988
Property, plant and equipment, net	126,055	120,068
Intangibles, net	41,342	43,554
Deferred income taxes	548	5,962
Investments in unconsolidated subsidiaries	19,999	16,335
Deferred costs	3,499	3,582
Other non-current assets	23,637	23,063
Total assets	366,546	389,552
LIABILITIES AND EQUITY
Accounts payable	9,655	7,575
Accounts payable to affiliates	383	1,925
Revolving credit agreements	10,000	15,000
Current maturities of long-term debt	647	1,125
Accrued payroll	13,241	17,204
Asset retirement obligations	3,092	3,092
Other current liabilities	7,168	8,055
Total current liabilities	44,186	53,976
Long-term debt	6,849	42,021
Asset retirement obligations	36,619	37,005
Pension and other postretirement obligations	10,550	11,827
Deferred compensation	12,939	12,939
Other long-term liabilities	15,202	12,336
Total liabilities	126,345	170,104
Common stock:
Capital in excess of par value	6,341	4,447
Retained earnings	239,817	216,490
Accumulated other comprehensive loss	(12,899)	(8,341)
Total stockholders' equity	240,201	219,448
Total liabilities and equity	366,546	389,552
Shares Outstanding Class A
Common stock:
Common stock	5,373	5,282
Shares Outstanding Class B
Common stock:
Common stock	$ 1,569	$ 1,570