CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 152,403	$ 203,820
Short-term investments	7,225	4,558
Accounts receivable, net of allowances of $3,687 and $4,480 at June 30, 2018 and December 31, 2017, respectively	199,949	200,112
Inventories	222,786	216,506
Prepaid expenses and other	36,177	37,328
Total current assets	618,540	662,324
Property, plant and equipment, net	460,237	459,169
Deferred income tax	39,811	40,580
Goodwill	132,829	134,187
Intangible assets, net	146,941	156,445
Other	38,414	35,968
Total assets	1,436,772	1,488,673
Current liabilities:
Line of credit	4,268	1,008
Accounts payable	104,575	108,001
Accrued liabilities and other	88,225	99,301
Income tax payable	16,920	18,216
Current portion of long-term debt	23,717	20,636
Total current liabilities	237,705	247,162
Long-term debt, net of current portion	162,121	247,492
Deferred tax liabilities	26,322	25,176
Other long-term liabilities	87,809	94,925
Total liabilities	513,957	614,755
Commitments and contingencies (See Note 8)
Stockholders' equity
Preferred stock - par value $1.00 per share; 1,000,000 shares authorized; no shares issued or outstanding
Common stock - par value $0.66 2/3 per share; 70,000,000 shares authorized; 49,846,164 and 49,130,090, issued and outstanding at June 30, 2018 and December 31, 2017, respectively	34,204	33,727
Additional paid-in capital	391,332	386,338
Retained earnings	576,280	532,687
Treasury stock, at cost, 1,457,206 shares held at June 30, 2018 and December 31, 2017	(37,768)	(37,768)
Accumulated other comprehensive loss	(81,633)	(83,480)
Total stockholders' equity	882,415	831,504
Noncontrolling interest	40,400	42,414
Total equity	922,815	873,918
Total liabilities and stockholders' equity	$ 1,436,772	$ 1,488,673