CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 49,523	$ 116,262
Accounts receivable, net of allowance for doubtful accounts of $5,577 in 2019 and $4,813 in 2018	288,563	323,533
Inventories	107,028	130,083
Income taxes receivable	20,771	35,832
Prepaid expenses	6,531	9,766
Assets held for sale	5,385
Other current assets	3,310	3,462
Total current assets	481,111	618,938
Property, plant and equipment, less accumulated depreciation of $1,381,482 in 2019 and $1,633,827 in 2018	528,925	517,982
Operating lease right-of-use assets	35,556
Goodwill	32,150	32,150
Other assets	32,121	30,510
Total assets	1,109,863	1,199,580
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	82,813	103,401
Accrued payroll and related expenses	24,022	25,715
Accrued insurance expenses	6,489	6,183
Accrued state, local and other taxes	7,368	3,081
Income taxes payable	849	4,706
Current portion of operating lease liabilities	11,066
Other accrued expenses	3,613	151
Total current liabilities	136,220	143,237
Long-term accrued insurance expenses	13,543	12,072
Long-term pension liabilities	33,575	29,638
Deferred income taxes	38,680	60,375
Long-term operating lease liabilities	30,165
Other long-term liabilities	2,505	3,839
Total liabilities	254,688	249,161
Common stock	21,450	21,454
Capital in excess of par value
Retained earnings	854,170	947,711
Accumulated other comprehensive loss	(20,445)	(18,746)
Total stockholders' equity	855,175	950,419
Total liabilities and stockholders' equity	$ 1,109,863	$ 1,199,580