CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	[1]
ASSETS
Cash and cash equivalents	$ 128,373	$ 91,050
Accounts receivable, net of allowance for doubtful accounts of $5,311 in 2018 and $4,471 in 2017	382,755	377,853
Inventories	128,957	114,866
Income taxes receivable	11,578	40,243
Prepaid expenses	6,344	8,992
Other current assets	5,583	7,131
Total current assets	663,590	640,135
Property, plant and equipment, less accumulated depreciation of $1,702,272 in 2018 and $1,659,311 in 2017	515,805	443,928
Goodwill	32,150	32,150
Other assets	34,117	31,011
Total assets	1,245,662	1,147,224
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	127,161	103,462
Accrued payroll and related expenses	32,140	23,577
Accrued insurance expenses	5,903	5,299
Accrued state, local and other taxes	7,110	8,655
Income taxes payable	4,999	3,224
Other accrued expenses	272	1,143
Total current liabilities	177,585	145,360
Long-term accrued insurance expenses	11,435	10,376
Long-term pension liabilities	30,294	35,635
Deferred income taxes	45,913	39,437
Other long-term liabilities	3,834	4,719
Total liabilities	269,061	235,527
Common stock	21,480	21,654
Capital in excess of par value	0	0
Retained earnings	971,382	906,745
Accumulated other comprehensive loss	(16,261)	(16,702)
Total stockholders' equity	976,601	911,697
Total liabilities and stockholders' equity	$ 1,245,662	$ 1,147,224

[1] (Note 1)