Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating Activities
Net income	$ 15,069	$ 13,983
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,977	9,391
Gain (loss) on disposal of fixed assets	(5)	202
Gain on business combination	(3,443)	0
Provision for receivable allowance	480	436
Share-based compensation expense	7,301	5,449
Income tax benefits from employee stock plans	3,087	3,058
Excess tax benefits from employee stock plans	(3,159)	(3,326)
Provision for excess and obsolete inventories	168	250
Deferred income taxes	(1,717)	860
Changes in operating assets and liabilities:
Accounts receivable, net	(27,676)	(24,408)
Inventories	(9,633)	(335)
Prepaid expenses	8,234	2,144
Other current assets	1,507	1,602
Net investment in sales-type leases	353	622
Other long-term assets	64	228
Accounts payable	1,364	2,494
Accrued compensation	(1,654)	(3,910)
Accrued liabilities	5,752	2,424
Deferred service revenue	(2,892)	2,640
Deferred gross profit	6,008	10,788
Other long-term liabilities	(995)	829
Net cash provided by operating activities	10,190	25,421
Investing Activities
Acquisition of intangible assets, intellectual property and patents	(225)	(191)
Software development for external use	(6,127)	(5,507)
Purchases of property and equipment	(3,764)	(7,335)
Business acquisitions, net of cash acquired	(23,625)	0
Net cash used in investing activities	(33,741)	(13,033)
Financing Activities
Proceeds from issuances under stock-based compensation plans	9,432	11,813
Employees' taxes paid related to restricted stock units	(2,046)	(1,729)
Common stock repurchases	(25,021)	(4,069)
Excess tax benefits from employee stock plans	3,159	3,326
Net cash (used) provided by financing activities	(14,476)	9,341
Effect of exchange rate changes on cash and cash equivalents	167	119
Net (decrease) increase in cash and cash equivalents	(37,860)	21,848
Cash and cash equivalents at beginning of period	125,888	104,531
Cash and cash equivalents at end of period	88,028	126,379
Supplemental cash flow information
Cash paid for interest	80	0
Cash paid for taxes, net of refunds	3,620	1,723
Supplemental disclosing of non-cash investing activities
Purchase of property and equipment	524	70
Non-cash activity Business acquisition	$ 9,197	$ 0