Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net income (loss)	$ (3,686)	$ 446
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	38,542	43,905
Loss on disposal of fixed assets	128	(9)
Share-based compensation expense	16,315	14,063
Income tax benefits from employee stock plans	11	1,256
Deferred income taxes	(11,071)	(4,767)
Amortization of debt financing fees	1,192	1,192
Changes in operating assets and liabilities, net of business acquisitions:
Accounts receivable	(21,710)	(25,802)
Inventories	(22,942)	(7,745)
Prepaid expenses	602	(5,782)
Other current assets	(5,133)	(89)
Investment in sales-type leases	6,643	(5,296)
Other long-term assets	(150)	1,153
Accounts payable	23,717	5,573
Accrued compensation	658	(687)
Accrued liabilities	4,021	(1,901)
Deferred revenue	(7,354)	12,819
Other long-term liabilities	865	(2,299)
Net cash provided by operating activities	20,648	26,030
Investing Activities
Purchases of intangible assets, intellectual property and patents	(160)	(1,311)
Software development for external use	(10,121)	(10,569)
Purchases of property and equipment	(9,374)	(10,005)
Business acquisitions, net of cash acquired	(4,446)	(271,458)
Net cash used in investing activities	(24,101)	(293,343)
Financing Activities
Proceeds from debt	37,000	247,051
Repayment of debt and revolving credit facility	(100,000)	(25,000)
Payment for contingent consideration	(2,400)	(3,000)
Proceeds from issuances under stock-based compensation plans	26,468	16,516
Employees' taxes paid related to restricted stock units	(3,133)	(1,917)
Net cash provided by (used in) financing activities	(42,065)	233,650
Effect of exchange rate changes on cash and cash equivalents	(1,504)	(1,267)
Net decrease in cash and cash equivalents	(47,022)	(34,930)
Cash and cash equivalents at beginning of period	54,488	82,217
Cash and cash equivalents at end of period	7,466	47,287
Supplemental disclosure of non-cash activities
Unpaid purchases of property and equipment	886	948
Effect of adoption of new accounting standard	$ 1,582	$ 0