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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities      
Net income $ 20,605 $ 603 $ 30,760
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 51,511 58,362 25,639
Loss on disposal of fixed assets 512 35 238
Gain on business combinations 0 0 (3,443)
Gain related to contingent liability 0 (600) 0
Share-based compensation expense 21,857 19,500 14,921
Income tax benefits from employee stock plans 11 1,703 4,535
Deferred income taxes (26,844) (10,882) (1,092)
Amortization of debt financing fees 1,590 1,590 0
Changes in operating assets and liabilities, net of business acquisitions:      
Accounts receivable (39,068) 8,047 (17,941)
Inventories (26,840) (3,362) (10,032)
Prepaid expenses (7,414) (4,321) 4,049
Other current assets (2,074) (1,093) 638
Investment in sales-type leases 6,625 (9,639) (4,661)
Other long-term assets (98) 2,043 496
Accounts payable 19,709 (4,963) (2,841)
Accrued compensation 519 (2,052) (2,032)
Accrued liabilities 4,383 (3,287) 5,456
Deferred revenue (1,219) 4,480 (5,521)
Other long-term liabilities 1,069 (6,264) (683)
Net cash provided by operating activities 24,834 49,900 38,486
Investing Activities      
Purchase of intangible assets, intellectual property and patents (160) (1,372) (415)
Software development for external use (15,040) (14,348) (12,132)
Purchases of property and equipment (15,341) (13,445) (7,542)
Business acquisitions, net of cash acquired (4,446) (312,158) (25,507)
Net cash used in investing activities (34,987) (341,323) (45,596)
Financing Activities      
Proceeds from debt, net 56,894 287,051 0
Repayment of debt and revolving credit facility (102,500) (34,500) 0
Payment for contingent consideration (2,400) (3,000) 0
Proceeds from issuances under stock-based compensation plans 30,121 17,691 17,091
Employees' taxes paid related to restricted stock units (5,892) (3,490) (3,627)
At the market offering, net of offering costs 13,900 0 0
Common stock repurchases 0 0 (50,021)
Net cash provided by (used in) financing activities (9,877) 263,752 (36,557)
Effect of exchange rate changes on cash and cash equivalents (2,034) (58) (4)
Net increase (decrease) in cash and cash equivalents (22,064) (27,729) (43,671)
Cash and cash equivalents at beginning of period 54,488 82,217 125,888
Cash and cash equivalents at end of period 32,424 54,488 82,217
Supplemental cash flow information      
Cash paid for interest 6,550 5,344 76
Cash paid for taxes, net of refunds 7,780 11,091 11,871
Supplemental disclosure of non-cash investing activities      
Non-cash activity business acquisition 3,400 0 7,386
Unpaid property and equipment purchases $ 1,691 $ 246 $ 1,398