Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	[1]
Current assets:
Cash and cash equivalents	$ 206,838	$ 230,965
Accounts receivable, net of allowance of $2,501 and $1,801	224,123	223,098
Inventories, net	90,568	89,684
Income tax receivable	446	3,602
Prepaid expenses and other	4,003	1,889
Total current assets	525,978	549,238
Property, plant and equipment - at cost:
Land and land improvements	60,648	52,354
Construction-in-progress	42,824	49,847
Buildings and improvements	152,723	152,536
Machinery and equipment	341,896	334,204
Furniture and fixtures	11,796	10,926
Total property, plant and equipment	609,887	599,867
Accumulated depreciation	(270,223)	(266,688)
Property, plant and equipment - net	339,664	333,179
Other assets	704	737
Total assets	866,346	883,154
Current liabilities:
Trade accounts payable	34,062	40,509
Accrued liabilities	23,646	34,787
Total current liabilities	57,708	75,296
Deferred income taxes and other	31,466	28,762
Commitments and contingencies
Stockholders’ equity:
Authorized shares – 2,000,000; none issued	0	0
Issued shares – 26,946,916 and 26,939,403	269	269
Additional paid-in capital	63,469	63,009
Treasury stock, at cost – 6,466,567 and 6,027,455 shares	(111,636)	(91,056)
Retained earnings	825,070	806,874
Total stockholders’ equity	777,172	779,096
Total liabilities and stockholders’ equity	$ 866,346	$ 883,154

[1] The balance sheet at December 31, 2019, as presented, is derived from the audited financial statements at that date.