Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities
Net income	$ 446	$ 23,105
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	43,905	18,457
(Gain) loss on disposal of fixed assets	(9)	114
Gain on business combination	0	(3,443)
Share-based compensation expense	14,063	11,267
Income tax benefits from employee stock plans	1,256	3,838
Excess tax benefits from employee stock plans	(1,560)	(3,942)
Deferred income taxes	(4,767)	(2,235)
Amortization of debt financing fees	1,192	0
Changes in operating assets and liabilities:
Accounts receivable	(25,802)	(25,590)
Inventories	(7,745)	(12,898)
Prepaid expenses	(5,782)	5,937
Other current assets	(89)	1,019
Investment in sales-type leases	(5,296)	(3,220)
Other long-term assets	1,153	247
Accounts payable	5,573	(127)
Accrued compensation	(687)	(5,003)
Accrued liabilities	(1,901)	4,608
Deferred revenue	12,819	(5,369)
Other long-term liabilities	(2,299)	(833)
Net cash provided by operating activities	24,470	5,932
Investing Activities
Purchases of intangible assets, intellectual property, and patents	(1,311)	(331)
Software development for external use	(10,569)	(9,445)
Purchases of property and equipment	(10,005)	(6,081)
Business acquisitions, net of cash acquired	(271,458)	(25,455)
Net cash used in investing activities	(293,343)	(41,312)
Financing Activities
Proceeds from debt, net	247,051	0
Repayment of debt and revolving credit facility	(25,000)	0
Payment for contingent consideration	(3,000)	0
Proceeds from issuances under stock-based compensation plans	16,516	15,665
Employees' taxes paid related to restricted stock units	(1,917)	(2,285)
Common stock repurchases	0	(50,021)
Excess tax benefits from employee stock plans	1,560	3,942
Net cash provided (used) by financing activities	235,210	(32,699)
Effect of exchange rate changes on cash and cash equivalents	(1,267)	(52)
Net decrease in cash and cash equivalents	(34,930)	(68,131)
Cash and cash equivalents at beginning of period	82,217	125,888
Cash and cash equivalents at end of period	47,287	57,757
Supplemental cash flow information
Cash paid for interest	4,079	94
Cash paid for taxes, net of refunds	7,223	7,027
Supplemental disclosure of non-cash investing activities
Unpaid purchases of property and equipment	948	554
Non-cash activity business acquisition	$ 0	$ 7,386