CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 247,802	$ 218,435
Short-term investments	29,842	64,685
Accounts receivable, net of allowances of $2,141 and $2,652 at December 31, 2016 and December 31, 2015, respectively	217,217	218,496
Inventories	193,483	202,832
Prepaid expenses and other	44,438	46,103
Total current assets	732,782	750,551
Property, plant and equipment, net	401,988	439,340
Deferred income tax	56,047	45,120
Goodwill	129,412	132,913
Intangible assets, net	174,876	196,409
Other	33,447	34,494
Total assets	1,528,552	1,598,827
Current liabilities:
Accounts payable	87,600	86,463
Accrued liabilities	71,562	77,801
Income tax payable	11,855	5,117
Current portion of long-term debt	14,356	10,282
Total current liabilities	185,373	179,663
Long-term debt, net of current portion	413,126	453,738
Deferred tax liabilities	28,213	32,276
Other long-term liabilities	81,373	90,153
Total liabilities	708,085	755,830
Commitments and contingencies (See Note 16)
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; 48,219,376 and 48,148,077, issued and outstanding at December 31, 2016 and December 31, 2015, respectively	32,919	32,404
Additional paid-in capital	354,574	344,086
Retained earnings	530,215	514,280
Treasury stock, at cost, 1,157,206 and 466,010 shares held at December 31, 2016 and December 31, 2015, respectively	(29,023)	(11,009)
Accumulated other comprehensive loss	(112,666)	(84,416)
Total stockholders' equity	776,019	795,345
Noncontrolling interest	44,448	47,652
Total equity	820,467	842,997
Total liabilities and stockholders' equity	$ 1,528,552	$ 1,598,827