Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 62,476	$ 40,416
Accounts receivable, net of allowance for doubtful accounts of $507 and $431 at June 30, 2018 and December 31, 2017, respectively	98,595	91,226
Inventories	70,071	60,696
Prepaid expenses	4,923	4,774
Prepaid income taxes	2,600	0
Assets held for sale	237	0
Other current assets	2,235	2,224
Total current assets	241,137	199,336
Property, plant and equipment, net	184,767	189,793
Goodwill	441,554	441,361
Intangible assets with finite lives, net	115,873	128,073
Other assets	6,136	5,073
Total assets	989,467	963,636
Current liabilities:
Trade accounts payable	30,079	28,451
Accrued expenses	21,206	22,930
Accrued compensation and other benefits	9,308	8,531
Dividends payable	39	13,484
Current portion of long-term debt	0	35,000
Total current liabilities	60,632	108,396
Revolving loan	210,750	0
Long-term debt	0	183,964
Deferred income taxes	48,547	48,548
Other long-term obligations	6,318	5,847
Total liabilities	326,247	346,755
Commitments and contingencies (note 16)
Stockholders' equity:
Preferred stock, $25 par value. Authorized 2,000,000 shares; none issued and outstanding	0	0
Common stock, $.0667 par value. Authorized 120,000,000 shares; 32,213,094 shares issued and 32,208,686 outstanding at June 30, 2018 and 32,019,605 shares issued and outstanding at December 31, 2017	2,148	2,135
Additional paid-in capital	161,005	151,749
Retained earnings	503,665	464,639
Accumulated other comprehensive loss	(3,161)	(1,642)
Treasury stock, at cost: 4,408 and 0 shares at June 30, 2018 and December 31, 2017, respectively	(437)	0
Total stockholders' equity	663,220	616,881
Total liabilities and stockholders' equity	$ 989,467	$ 963,636