CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash provided by operating activities:
Net income	$ 12,761	$ 8,787
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,849	8,788
Provision for doubtful accounts	69	48
Provision for inventory write-downs	1,550	1,130
Deferred income taxes	901	(111)
Tax benefit from exercise of stock options and vested restricted stock	1,154	399
Excess tax benefit from stock-based compensation	(1,142)	(366)
Shares issued for employee benefit plan	537	446
Stock-based compensation	3,251	2,561
Changes in operating assets and liabilities:
Accounts receivable	(12,856)	638
Inventories	5,095	(16,996)
Prepaid expenses and other assets	134	143
Accounts payable and accrued expenses	10,382	2,647
Accrued income taxes	(1,894)	(168)
Net cash provided by operating activities	28,791	7,946
Cash used for investing activities:
Acquisition of property, plant, and equipment	(7,714)	(4,655)
Acquisition of intangible assets	(663)	(654)
Net cash used for investing activities	(8,377)	(5,309)
Cash provided by (used for) financing activities:
Issuance of debt	0	19,500
Payment of debt	0	(19,500)
Proceeds from stock options exercised	4,665	3,946
Treasury stock purchased	(14,275)	(2,435)
Excess tax benefit from stock-based compensation	1,142	366
Net cash provided by (used for) financing activities	(8,468)	1,877
Effect of exchange rate changes on cash	(478)	638
Net increase (decrease) in cash and cash equivalents	11,468	5,152
Cash and cash equivalents at beginning of year	76,174	44,593
Cash and cash equivalents at end of period	87,642	49,745
Supplemental Cash Flow Information:
Income taxes paid	3,182	2,420
Interest paid	$ 0	$ 43