CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 182,411	$ 203,820
Short-term investments	3,851	4,558
Accounts receivable, net of allowances of $4,039 and $4,480 at March 31, 2018 and December 31, 2017, respectively	174,141	200,112
Inventories	236,501	216,506
Prepaid expenses and other	37,415	37,328
Total current assets	634,319	662,324
Property, plant and equipment, net	469,654	459,169
Deferred income tax	41,157	40,580
Goodwill	135,994	134,187
Intangible assets, net	151,810	156,445
Other	38,428	35,968
Total assets	1,471,362	1,488,673
Current liabilities:
Line of credit	4,466	1,008
Accounts payable	106,973	108,001
Accrued liabilities and other	86,027	99,301
Income tax payable	21,041	18,216
Current portion of long-term debt	21,876	20,636
Total current liabilities	240,383	247,162
Long-term debt, net of current portion	199,924	247,492
Deferred tax liabilities	26,321	25,176
Other long-term liabilities	94,925	94,925
Total liabilities	561,553	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; 49,571,038 and 49,130,090, issued and outstanding at March 31, 2018 and December 31, 2017, respectively	34,021	33,727
Additional paid-in capital	385,928	386,338
Retained earnings	551,213	532,687
Treasury stock, at cost, 1,457,206 shares held at March 31, 2018 and December 31, 2017	(37,768)	(37,768)
Accumulated other comprehensive loss	(64,841)	(83,480)
Total stockholders' equity	868,553	831,504
Noncontrolling interest	41,256	42,414
Total equity	909,809	873,918
Total liabilities and stockholders' equity	$ 1,471,362	$ 1,488,673