Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 340,991	$ 271,513
Restricted cash	1,043	0
Accounts receivable, net	129,357	138,478
Inventories	68,889	74,002
Income tax receivable, net	0	9,996
Prepaid expenses and other current assets	15,754	16,229
Total current assets	556,034	510,218
Property, plant and equipment, net	386,457	376,448
Intangible assets, net	29,202	33,865
Goodwill	41,001	41,001
Deferred tax assets, net	4,864	6,096
Other assets	6,644	2,483
Total assets	1,024,202	970,111
Current liabilities:
Accounts payable	30,111	34,649
Accrued expenses and other current liabilities	3,918	6,368
Accrued compensation	32,626	34,537
Notes payable, current portion	0	20,000
Contingent consideration, current portion	2,393	3,266
Income taxes payable	1,875	0
Deferred revenue, current portion	4,509	7,036
Total current liabilities	75,432	105,856
Contingent consideration, net of current portion	9,398	9,919
Long-term indebtedness	248,994	248,094
Deferred revenue, net of current portion	24,966	8,433
Other liabilities	1,702	1,604
Total liabilities	360,492	373,906
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value; 15,000,000 shares authorized, 0 shares issued and outstanding at both September 30, 2017 and December 31, 2016	0	0
Common stock, $0.001 par value; 200,000,000 shares authorized, 41,807,978 shares issued and 41,382,429 shares outstanding at September 30, 2017; 40,996,890 shares issued and 40,574,060 shares outstanding at December 31, 2016	41	41
Treasury stock, at cost, 425,549 and 422,830 common shares at September 30, 2017 and December 31, 2016, respectively	(6,503)	(6,420)
Additional paid-in capital	370,855	352,435
Accumulated other comprehensive loss	(3,815)	(4,331)
Retained earnings	303,132	254,480
Total stockholders' equity	663,710	596,205
Total liabilities and stockholders' equity	$ 1,024,202	$ 970,111