Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income (loss)	$ 3,269	$ (21,304)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	17,511	17,492
Stock-based compensation expense	5,418	4,812
Deferred taxes	719	76
Investment and debt related amortization	248	197
(Gain) loss on disposal of property and equipment	(22)	131
Adjustment to fair value of penalty payment derivative	(141)	(289)
Allowance for doubtful accounts	628	287
Asset Impairment Charges	368
Foreign currency remeasurement and other, net	(1,867)	(1,233)
Change in assets and liabilities, net of effects of acquisitions:
Accounts receivable	8,035	(14,781)
Inventories	(13,415)	5,224
Prepaid expenses and other assets	1,962	(4,270)
Accounts payable	(1,718)	4,974
Accrued and other liabilities	117	(2,744)
Net cash provided by (used in) operating activities	21,112	(11,428)
Cash flows from investing activities
Purchase of property, plant and equipment	(11,051)	(9,124)
Proceeds from sale of property, plant and equipment and other assets	200	8
Purchase of marketable securities	(28,936)	(9,654)
Proceeds from sale of marketable securities	12,938	9,634
Proceeds from maturity of securities	1,000	9,448
Decrease (increase) in restricted cash	9,784	(12,251)
Net cash used in investing activities	(16,065)	(11,939)
Cash flows from financing activities
Proceeds from public stock offering, net of offering costs	45,646
Proceeds from exercise of stock options and issuance of stock under ESPP	1,186	1,992
Tax withholding on restricted stock units	(688)	(370)
Proceeds from bank loans	56,512	8,105
Repayment of bank and acquisition-related loans	(70,162)	(8,651)
Proceeds from issuance of notes payable	16,999	18,822
Repayment of notes payable	(20,072)	(15,851)
Payment of acquisition-related contingent consideration		(1,985)
Net cash provided by financing activities	29,421	2,062
Effect of exchange rates on cash and cash equivalents	(253)	(527)
Net increase (decrease) in cash and cash equivalents	34,215	(21,832)
Cash and cash equivalents at the beginning of the period	43,035	57,101
Cash and cash equivalents at the end of the period	77,250	35,269
Supplemental disclosure of noncash investing and financing activities:
Modification of bank loan	15,786
Issuance of note to seller of acquired business	15,482
Transfer of restricted investments to short-term investments	8,296
Transfer of short-term investments to restricted investments		8,295
Changes in unpaid property, plant and equipment	$ (768)	$ 302