CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 188,755	$ 243,000
Short-term investments	24,586	11,726
Accounts receivable, net of allowances of $2,386 and $1,682 at September 30, 2015 and December 31, 2014, respectively	202,467	188,248
Inventories	197,698	182,026
Deferred income taxes, current	11,193	11,295
Prepaid expenses and other	38,389	50,510
Total current assets	663,088	686,805
Property, plant and equipment, at cost	835,721	747,723
Accumulated depreciation	(464,685)	(437,792)
Property, plant and equipment, net	371,036	309,931
Deferred income tax, non-current	32,259	32,550
Goodwill	79,389	81,229
Intangible assets, net	42,841	45,028
Other	24,580	23,614
Total assets	1,213,193	1,179,157
Current liabilities:
Lines of credit and short-term debt	261	1,064
Accounts payable	86,388	79,390
Accrued liabilities	91,868	60,436
Income tax payable	9,106	8,381
Total current liabilities	187,623	149,271
Long-term debt, net of current portion	93,510	140,787
Other long-term liabilities	74,591	78,932
Total liabilities	$ 355,724	$ 368,990
Commitments and contingencies (See Note H)
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; 48,588,184 and 47,591,092 issued and outstanding at September 30, 2015 and December 31, 2014, respectively	$ 32,394	$ 31,729
Additional paid-in capital	335,835	314,942
Retained earnings	519,053	490,006
Accumulated other comprehensive loss	(77,564)	(68,402)
Total stockholders' equity	809,718	768,275
Noncontrolling interest	47,751	41,892
Total equity	857,469	810,167
Total liabilities and stockholders' equity	$ 1,213,193	$ 1,179,157