CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 671	$ 5,748
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,683	4,770
Loss on sales and/or abandonment of property and equipment	7	0
Write-off of patents	2	0
Acquired in-process research and development	0	175
Amortization of deferred credits	(32)	(24)
Amortization of long-term debt issuance costs	199	0
Deferred income taxes	2	13
Excess tax benefit from stock-based compensation	(53)	(4)
Stock-based compensation expense	459	555
Changes in operating assets and liabilities, net of effects from acquisitions:
Trade receivables	(1,473)	(4,871)
Employee receivables	(18)	(20)
Other receivables	(586)	(1,011)
Inventories	2,149	(544)
Prepaid expenses	(1,242)	(625)
Prepaid income taxes	17	(8)
Income tax refund receivable	(782)	42
Other assets	(377)	(436)
Trade payables	(2,084)	1,295
Accrued expenses	(2,280)	653
Advances from employees	90	404
Income taxes payable	(34)	1,425
Deferred compensation payable	281	481
Other long-term obligations	294	(533)
Total adjustments	2,222	1,737
Net cash provided by operating activities	2,893	7,485
Capital expenditures for:
Property and equipment	(19,961)	(17,733)
Patents and trademarks	(394)	(402)
Proceeds from the sale of property and equipment	8	3
Cash paid in acquisitions	(1,000)	(11,770)
Net cash used in investing activities	(21,347)	(29,902)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	571	118
Borrowings under long-term debt	34,199	66,573
Payments on long-term debt	(17,512)	(44,786)
Excess tax benefits from stock-based compensation	53	4
Proceeds from industrial assistant grants	750	0
Contingent payments related to acquisitions	(19)	0
Net cash provided by financing activities	18,042	21,909
EFFECT OF EXCHANGE RATES ON CASH	(290)	41
NET DECREASE IN CASH AND CASH EQUIVALENTS	(702)	(467)
CASH AND CASH EQUIVALENTS:
Beginning of period	9,719	10,128
End of period	9,017	9,661
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION-Cash paid during the period for:
Interest (net of capitalized interest of $394 and $66, respectively)	1,493	63
Income taxes	403	546
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Property and equipment purchases in accounts payable	5,354	7,575
Acquisition purchases in accrued expenses and other long-term obligations	$ 0	$ 12,500