CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	[1]
ASSETS
Cash and cash equivalents	$ 113,014	$ 116,262
Accounts receivable, net of allowance for doubtful accounts of $5,121 in 2019 and $4,813 in 2018	319,205	323,533
Inventories	124,464	130,083
Income taxes receivable	8,613	35,832
Prepaid expenses	9,343	9,766
Other current assets	3,213	3,462
Total current assets	577,852	618,938
Property, plant and equipment, less accumulated depreciation of $1,656,164 in 2019 and $1,633,827 in 2018	537,289	517,982
Operating lease right-of-use assets	45,854
Goodwill	32,150	32,150
Other assets	33,347	30,510
Total assets	1,226,492	1,199,580
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	109,892	103,401
Accrued payroll and related expenses	26,162	25,715
Accrued insurance expenses	6,362	6,183
Accrued state, local and other taxes	4,728	3,081
Income taxes payable	3,519	4,706
Current portion of operating lease liabilities	12,547
Other accrued expenses	317	151
Total current liabilities	163,527	143,237
Long-term accrued insurance expenses	12,709	12,072
Long-term pension liabilities	32,553	29,638
Deferred income taxes	52,986	60,375
Long-term operating lease liabilities	34,348
Other long-term liabilities	2,506	3,839
Total liabilities	298,629	249,161
Common stock	21,514	21,454
Capital in excess of par value	0	0
Retained earnings	927,556	947,711
Accumulated other comprehensive loss	(21,207)	(18,746)
Total stockholders' equity	927,863	950,419
Total liabilities and stockholders' equity	$ 1,226,492	$ 1,199,580

[1] Note 1