CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 203,820	$ 247,802
Short-term investments	4,558	29,842
Accounts receivable, net of allowances of $4,480 and $2,141 at December 31, 2017 and December 31, 2016, respectively	200,112	217,217
Inventories	216,506	193,483
Prepaid expenses and other	37,328	44,438
Total current assets	662,324	732,782
Property, plant and equipment, net	459,169	401,988
Deferred income tax	40,580	56,047
Goodwill	134,187	129,412
Intangible assets, net	156,445	174,876
Other	35,968	33,447
Total assets	1,488,673	1,528,552
Current liabilities:
Line of credit	1,008
Accounts payable	108,001	87,600
Accrued liabilities	99,301	71,562
Income tax payable	18,216	11,855
Current portion of long-term debt	20,636	14,356
Total current liabilities	247,162	185,373
Long-term debt, net of current portion	247,492	413,126
Deferred tax liabilities	25,176	28,213
Other long-term liabilities	94,925	81,373
Total liabilities	614,755	708,085
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; 49,130,090 and 48,219,376, issued and outstanding at December 31, 2017 and December 31, 2016, respectively	33,727	32,919
Additional paid-in capital	386,338	354,574
Retained earnings	532,687	530,215
Treasury stock, at cost, 1,457,206 and 1,157,206 shares held at December 31, 2017 and December 31, 2016, respectively	(37,768)	(29,023)
Accumulated other comprehensive loss	(83,480)	(112,666)
Total stockholders' equity	831,504	776,019
Noncontrolling interest	42,414	44,448
Total equity	873,918	820,467
Total liabilities and stockholders' equity	$ 1,488,673	$ 1,528,552