Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 115,061	$ 85,257
Trade accounts receivable, net	13,540	20,817
Accounts receivable from affiliates	6,107	7,999
Inventories	33,087	31,209
Assets held for sale	0	4,330
Prepaid expenses and other	12,515	14,562
Total current assets	180,310	164,174
Property, plant and equipment, net	129,585	124,554
Intangibles, net	38,273	40,516
Investments in unconsolidated subsidiaries	23,100	20,091
Operating lease right-of-use assets	11,721
Other non-current assets	29,781	27,656
Total assets	412,770	376,991
LIABILITIES AND EQUITY
Accounts payable	9,004	7,746
Accounts payable to affiliates	37	1,653
Revolving credit agreements	0	4,000
Current maturities of long-term debt	394	654
Asset retirement obligations	1,826	1,826
Accrued payroll	20,243	19,853
Deferred compensation	13,465	0
Other current liabilities	7,806	6,516
Total current liabilities	52,775	42,248
Long-term debt	7,284	6,367
Operating lease liabilities	12,669
Asset retirement obligations	33,365	35,877
Pension and other postretirement obligations	9,365	10,429
Deferred income taxes	7,361	2,846
Deferred compensation	0	12,939
Other long-term liabilities	6,696	15,581
Total liabilities	129,515	126,287
Common stock:
Capital in excess of par value	9,829	7,042
Retained earnings	279,801	250,352
Accumulated other comprehensive loss	(13,369)	(13,611)
Total stockholders' equity	283,255	250,704
Total liabilities and equity	412,770	376,991
Class A Common Stock
Common stock:
Common stock	5,425	5,352
Class B Common Stock
Common stock:
Common stock	$ 1,569	$ 1,569