Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 79,952	$ 101,600
Accounts receivable, net	17,908	14,611
Accounts receivable from affiliates	12,664	19,919
Inventories, net	29,159	30,015
Prepaid expenses and other	12,703	10,843
Total current assets	152,386	176,988
Property, plant and equipment, net	123,632	120,068
Intangibles, net	42,056	43,554
Deferred income taxes	2,663	5,962
Investments in unconsolidated subsidiaries	18,444	16,335
Deferred costs	3,527	3,582
Other non-current assets	23,310	23,063
Total assets	366,018	389,552
LIABILITIES AND EQUITY
Accounts payable	9,120	7,575
Accounts payable to affiliates	4,609	1,925
Revolving credit agreements	12,000	15,000
Current maturities of long-term debt	1,037	1,125
Accrued payroll	9,627	17,204
Asset retirement obligations	3,092	3,092
Other current liabilities	6,436	8,055
Total current liabilities	45,921	53,976
Long-term debt	14,946	42,021
Asset retirement obligations	36,348	37,005
Pension and other postretirement obligations	10,917	11,827
Deferred compensation	12,939	12,939
Other long-term liabilities	13,975	12,336
Total liabilities	135,046	170,104
Common stock:
Capital in excess of par value	5,269	4,447
Retained earnings	231,761	216,490
Accumulated other comprehensive loss	(13,002)	(8,341)
Total stockholders' equity	230,972	219,448
Total liabilities and equity	366,018	389,552
Shares Outstanding Class A
Common stock:
Common stock	5,375	5,282
Shares Outstanding Class B
Common stock:
Common stock	$ 1,569	$ 1,570