Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities
Net loss	$ (10,754)	$ (378)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	12,448	14,473
Loss on disposal of fixed assets	0	13
Share-based compensation expense	5,511	3,891
Income tax benefits from employee stock plans	11	164
Deferred income taxes	(9,091)	(1,042)
Amortization of debt financing fees	397	397
Changes in operating assets and liabilities, net of business acquisitions:
Accounts receivable	18,870	(1,070)
Inventories	(6,933)	(5,113)
Prepaid expenses	871	1,983
Other current assets	372	324
Investment in sales-type leases	1,120	(8,928)
Other long-term assets	(38)	1,232
Accounts payable	11,104	1,568
Accrued compensation	1,955	4,114
Accrued liabilities	(115)	417
Deferred revenue	1,948	12,663
Other long-term liabilities	506	(2,701)
Net cash provided by operating activities	28,182	22,007
Investing Activities
Purchases of intangible assets, intellectual property and patents	(160)	(1,074)
Software development for external use	(4,225)	(3,070)
Purchases of property and equipment	(2,452)	(4,261)
Business acquisitions, net of cash acquired	0	(271,458)
Net cash used in investing activities	(6,837)	(279,863)
Financing Activities
Proceeds from debt, net	0	247,059
Repayment of debt and revolving credit facility	(40,000)	(20,000)
Payment for contingent consideration	0	(3,000)
Proceeds from issuances under stock-based compensation plans	10,916	5,149
Employees' taxes paid related to restricted stock units	(1,052)	(382)
Net cash provided by (used in) financing activities	(30,136)	228,826
Effect of exchange rate changes on cash and cash equivalents	651	300
Net decrease in cash and cash equivalents	(8,140)	(28,730)
Cash and cash equivalents at beginning of period	54,488	82,217
Cash and cash equivalents at end of period	46,348	53,487
Supplemental disclosure of non-cash activities
Unpaid purchases of property and equipment	865	468
Effect of adoption of new accounting standard	$ 1,582	$ 0