Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 315,627	$ 271,513
Accounts receivable, net	102,511	138,478
Inventories	70,529	74,002
Income tax receivable, net	6,119	9,996
Prepaid expenses and other current assets	14,955	16,229
Total current assets	509,741	510,218
Property, plant and equipment, net	380,240	376,448
Intangible assets, net	30,756	33,865
Goodwill	41,001	41,001
Deferred tax assets, net	5,022	6,096
Other assets	3,723	2,483
Total assets	970,483	970,111
Current liabilities:
Accounts payable	29,604	34,649
Accrued expenses and other current liabilities	1,874	6,368
Accrued compensation	24,326	34,537
Notes payable, current portion	0	20,000
Contingent consideration, current portion	1,710	3,266
Deferred revenue, current portion	15,412	7,036
Total current liabilities	72,926	105,856
Contingent consideration, net of current portion	9,503	9,919
Long-term indebtedness	248,693	248,094
Deferred revenue, net of current portion	17,092	8,433
Other liabilities	1,670	1,604
Total liabilities	349,884	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 June 30, 2017 and December 31, 2016	0	0
Common stock, $0.001 par value; 200,000,000 shares authorized, 41,532,614 shares issued and 41,107,065 shares outstanding at June 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 June 30, 2017 and December 31, 2016, respectively	(6,503)	(6,420)
Additional paid-in capital	360,999	352,435
Accumulated other comprehensive loss	(3,519)	(4,331)
Retained earnings	269,581	254,480
Total stockholders' equity	620,599	596,205
Total liabilities and stockholders' equity	$ 970,483	$ 970,111