CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash provided by operating activities:
Net income	$ 13,564	$ 12,761
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,412	8,849
Provision for doubtful accounts	138	69
Provision for inventory write-downs	1,617	1,550
Deferred income taxes	(655)	901
Tax benefit from exercise of stock options and vested restricted stock	689	1,154
Excess tax benefit from stock-based compensation	(713)	(1,142)
Shares issued for employee benefit plan	593	537
Stock-based compensation	3,983	3,251
Changes in operating assets and liabilities:
Accounts receivable	(8,741)	(12,856)
Inventories	(14,994)	5,095
Prepaid expenses and other assets	(378)	134
Accounts payable and accrued expenses	1,395	10,382
Accrued income taxes	32	(1,894)
Net cash provided by operating activities	5,942	28,791
Cash used for investing activities:
Acquisition of property, plant, and equipment	(15,655)	(7,714)
Acquisition of intangible assets	(1,252)	(663)
Net cash used for investing activities	(16,907)	(8,377)
Cash provided by (used for) financing activities:
Borrowings under line of credit	19,500	0
Repayments on line of credit	(7,500)	0
Proceeds from stock options exercised	1,648	4,665
Treasury stock purchased	(34,297)	(14,275)
Excess tax benefit from stock-based compensation	713	1,142
Net cash provided by (used for) financing activities	(19,936)	(8,468)
Effect of exchange rate changes on cash	542	(478)
Net increase (decrease) in cash and cash equivalents	(30,359)	11,468
Cash and cash equivalents at beginning of year	112,521	76,174
Cash and cash equivalents at end of period	82,162	87,642
Supplemental Cash Flow Information:
Income taxes paid	$ 2,979	$ 3,182