Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 14,582	$ 7,993
Adjustments to reconcile net income to cash flows:
Depreciation and amortization	5,578	5,297
Non-cash deferred revenue	(2,310)	(137)
Increase in inventory reserve	1,936	1,406
Unrealized (gain)/loss on foreign currency contracts	(1,006)	834
Stock based compensation	1,535	1,077
Deferred income tax provision	3,911	2,076
Other	238	(39)
Changes in assets and liabilities:
Trade receivables	45,861	35,763
Inventories	(21,009)	(28,963)
Prepaid expenses and other current assets	(3,993)	1,062
Accounts payable and other current liabilities	3,993	(2,167)
Deferred revenue and advance payments	39,926	12,557
Other non-current assets and liabilities	147	(870)
Discontinued operations:
Net cash provided by/(used in) discontinued operations	382	(517)
Net cash provided by operating activities	89,771	35,372
Cash flows from investing activities:
Capital expenditures	(19,840)	(12,641)
Other	13	596
Net cash used in investing activities	(19,827)	$ (12,045)
Cash flows from financing activities:
Repayment of debt	(30,000)
Proceeds from stock options exercised	420	$ 1,540
Other	408	60
Net cash (used in)/provided by financing activities	(29,172)	1,600
Effect of exchange rate changes on cash and cash equivalents	851	(2,535)
Net increase in cash and cash equivalents	41,623	22,392
Cash and cash equivalents at beginning of period	43,974	45,518
Cash and cash equivalents at end of period	$ 85,597	$ 67,910