CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 237,006	$ 218,435
Short-term investments	43,051	64,685
Accounts receivable, net of allowances of $2,729 and $2,625 at March 31, 2016 and December 31, 2015, respectively	216,507	218,496
Inventories	204,976	202,832
Prepaid expenses and other	42,990	46,103
Total current assets	744,530	750,551
Property, plant and equipment, net	431,192	439,340
Deferred income tax, non-current	44,892	45,120
Goodwill	134,125	132,913
Intangible assets, net	191,071	196,409
Other	34,123	34,494
Total assets	1,579,933	1,598,827
Current liabilities:
Accounts payable	87,429	86,463
Accrued liabilities	72,706	77,801
Income tax payable	2,680	5,117
Current portion of long-term debt	10,290	10,282
Total current liabilities	173,105	179,663
Long-term debt, net of current portion	439,948	453,738
Deferred tax liabilities	32,275	32,276
Other long-term liabilities	88,325	90,153
Total liabilities	$ 733,653	$ 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; 48,300,695 and 48,148,077, issued and outstanding at March 31, 2016 and December 31, 2015, respectively	$ 32,512	$ 32,404
Additional paid-in capital	346,131	344,086
Retained earnings	512,547	514,280
Treasury stock, at cost, 466,010 shares held at March 31, 2016 and December 31, 2015	(11,009)	(11,009)
Accumulated other comprehensive loss	(81,612)	(84,416)
Total stockholders' equity	798,569	795,345
Noncontrolling interest	47,711	47,652
Total equity	846,280	842,997
Total liabilities and stockholders' equity	$ 1,579,933	$ 1,598,827