CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash provided by operating activities:
Net income	$ 19,838	$ 23,632
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,459	13,445
Provision for doubtful accounts	189	16
Provision for inventory write-downs	2,258	2,385
Deferred income taxes	(515)	777
Tax benefit from exercise of stock options and vested restricted stock	1,023	2,141
Excess tax benefit from stock-based compensation	(1,071)	(2,124)
Shares issued for employee benefit plan	734	703
Stock-based compensation	5,923	4,831
Changes in operating assets and liabilities:
Restricted cash	(4,623)	0
Accounts receivable	(17,851)	(13,988)
Inventories	(20,261)	(577)
Prepaid expenses and other assets	426	(403)
Accounts payable and accrued expenses	21,821	13,647
Accrued income taxes	180	(1,138)
Net cash provided by operating activities	22,530	43,347
Cash used for investing activities:
Acquisition of net assets of Ecolink Intelligent Technology, Inc., net of cash acquired	(12,482)	0
Acquisition of property, plant, and equipment	(26,376)	(12,480)
Acquisition of intangible assets	(1,877)	(1,374)
Net cash used for investing activities	(40,735)	(13,854)
Cash provided by (used for) financing activities:
Borrowings under line of credit	69,500	0
Repayments on line of credit	(22,500)	0
Proceeds from stock options exercised	1,648	6,400
Treasury stock purchased	(78,708)	(15,184)
Excess tax benefit from stock-based compensation	1,071	2,124
Net cash provided by (used for) financing activities	(28,989)	(6,660)
Effect of exchange rate changes on cash	(1,019)	(43)
Net increase (decrease) in cash and cash equivalents	(48,213)	22,790
Cash and cash equivalents at beginning of year	112,521	76,174
Cash and cash equivalents at end of period	64,308	98,964
Supplemental cash flow information:
Income taxes paid	3,922	4,091
Interest paid	$ 68	$ 0