Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 8,493	$ 19,316
Accounts receivable, net	233,487	283,607
Inventories, net	221,342	209,393
Prepaid expenses and other current assets	20,107	21,715
Total current assets	483,429	534,031
Property, plant and equipment, net	459,724	540,427
Operating lease assets, net	43,616
Goodwill, net	482,306	647,018
Other intangible assets, net	230,091	255,301
Other noncurrent assets	28,701	27,044
Total assets	1,727,867	2,003,821
Current liabilities:
Current portion of long-term debt	25,617	25,561
Accounts payable	78,368	77,511
Accrued liabilities	48,840	60,730
Current operating lease liabilities	8,311
Income taxes payable	4,174	3,072
Deferred revenue	17,761	14,160
Total current liabilities	183,071	181,034
Long-term debt	222,552	306,177
Long-term operating lease liabilities	35,777
Deferred income taxes	38,079	53,831
Other noncurrent liabilities	24,421	23,011
Total liabilities	503,900	564,053
Stockholders' equity:
Common stock, $.01 par value, 200,000,000 shares authorized, 72,546,321 shares and 71,753,937 shares issued, respectively	726	718
Additional paid-in capital	1,114,521	1,097,758
Retained earnings	797,710	1,029,518
Accumulated other comprehensive loss	(67,746)	(71,397)
Treasury stock, at cost, 12,045,065 and 11,784,242 shares, respectively	(621,244)	(616,829)
Total stockholders' equity	1,223,967	1,439,768
Total liabilities and stockholders' equity	$ 1,727,867	$ 2,003,821