CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 192,554	$ 218,435
Short-term investments	44,245	64,685
Accounts receivable, net of allowances of $2,481 and $2,625 at June 30, 2016 and December 31, 2015, respectively	229,913	218,496
Inventories	209,875	202,832
Prepaid expenses and other	41,663	46,103
Total current assets	718,250	750,551
Property, plant and equipment, net	425,177	439,340
Deferred income tax, non-current	47,919	45,120
Goodwill	131,389	132,913
Intangible assets, net	185,503	196,409
Other	34,628	34,494
Total assets	1,542,866	1,598,827
Current liabilities:
Accounts payable	93,279	86,463
Accrued liabilities	76,533	77,801
Income tax payable		5,117
Current portion of long-term debt	10,290	10,282
Total current liabilities	180,102	179,663
Long-term debt, net of current portion	399,891	453,738
Deferred tax liabilities	32,207	32,276
Other long-term liabilities	90,810	90,153
Total liabilities	703,010	755,830
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; 48,470,103 and 48,148,077, issued and outstanding at June 30, 2016 and December 31, 2015, respectively	32,626	32,404
Additional paid-in capital	349,363	344,086
Retained earnings	518,299	514,280
Treasury stock, at cost, 466,010 shares held at June 30, 2016 and December 31, 2015	(11,009)	(11,009)
Accumulated other comprehensive loss	(97,352)	(84,416)
Total stockholders' equity	791,927	795,345
Noncontrolling interest	47,929	47,652
Total equity	839,856	842,997
Total liabilities and stockholders' equity	$ 1,542,866	$ 1,598,827