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Unaudited Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
ASSETS    
Cash and cash equivalents $ 79,058 $ 85,257
Trade accounts receivable, net 19,341 20,817
Accounts receivable from affiliates 8,805 7,999
Inventories 32,799 31,209
Assets held for sale 5,130 4,330
Prepaid expenses and other 18,898 14,562
Total current assets 164,031 164,174
Property, plant and equipment, net 125,842 124,554
Intangibles, net 39,869 40,516
Investments in unconsolidated subsidiaries 23,268 20,091
Deferred costs 3,215 3,244
Operating lease right-of-use assets 12,479  
Other non-current assets 25,083 24,412
Total assets 393,787 376,991
LIABILITIES AND EQUITY    
Accounts payable 8,224 7,746
Accounts payable to affiliates 637 1,653
Revolving credit agreements 4,000 4,000
Current maturities of long-term debt 573 654
Accrued payroll 13,515 19,853
Deferred compensation 13,465 0
Asset retirement obligations 1,826 1,826
Other current liabilities 7,330 6,516
Total current liabilities 49,570 42,248
Long-term debt 7,448 6,367
Operating lease liabilities 13,305  
Asset retirement obligations 36,384 35,877
Pension and other postretirement obligations 10,067 10,429
Deferred income taxes 6,026 2,846
Deferred compensation 0 12,939
Other long-term liabilities 6,720 15,581
Total liabilities 129,520 126,287
Common stock:    
Capital in excess of par value 6,573 7,042
Retained earnings 264,217 250,352
Accumulated other comprehensive loss (13,510) (13,611)
Total stockholders' equity 264,267 250,704
Total liabilities and equity 393,787 376,991
Shares Outstanding Class A    
Common stock:    
Common stock 5,418 5,352
Shares Outstanding Class B    
Common stock:    
Common stock $ 1,569 $ 1,569