CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 266,605	$ 247,802
Short-term investments	16,420	29,842
Accounts receivable, net of allowances of $2,981 and $2,141 at June 30, 2017 and December 31, 2016, respectively	223,011	217,217
Inventories	207,726	193,483
Prepaid expenses and other	44,671	44,438
Total current assets	758,433	732,782
Property, plant and equipment, net	427,068	401,988
Deferred income tax	62,114	56,047
Goodwill	132,290	129,412
Intangible assets, net	165,696	174,876
Other	33,528	33,447
Total assets	1,579,129	1,528,552
Current liabilities:
Accounts payable	110,338	87,600
Accrued liabilities	88,543	71,562
Income tax payable	265	11,855
Current portion of long-term debt	17,895	14,356
Total current liabilities	217,041	185,373
Long-term debt, net of current portion	383,336	413,126
Deferred tax liabilities	28,587	28,213
Other long-term liabilities	82,858	81,373
Total liabilities	711,822	708,085
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; 48,734,340 and 48,219,376, issued and outstanding at June 30, 2017 and December 31, 2016, respectively	33,263	32,919
Additional paid-in capital	370,344	354,574
Retained earnings	548,887	530,215
Treasury stock, at cost, 1,157,206 shares held at June 30, 2017 and December 31, 2016	(29,023)	(29,023)
Accumulated other comprehensive loss	(97,001)	(112,666)
Total stockholders' equity	826,470	776,019
Noncontrolling interest	40,837	44,448
Total equity	867,307	820,467
Total liabilities and stockholders' equity	$ 1,579,129	$ 1,528,552