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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating Activities    
Net income (loss) $ 2,720 $ (10,335)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 12,310 12,448
Share-based compensation expense 6,528 5,511
Income tax benefits from employee stock plans 0 11
Deferred income taxes (5,128) (8,826)
Amortization of debt financing fees 573 397
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable and unbilled (632) 21,642
Inventories (6,881) (6,933)
Prepaid expenses (769) 79
Other current assets (997) 374
Investment in sales-type leases (1,491) 1,120
Prepaid commissions 1,796 208
Other long-term assets (1,673) (9,435)
Accounts payable (9,416) 11,104
Accrued compensation 2,391 1,955
Accrued liabilities 4,276 (115)
Deferred revenue 15,118 8,471
Other long-term liabilities 131 506
Net cash provided by operating activities 18,856 28,182
Investing Activities    
Purchases of intangible assets, intellectual property and patents 0 (160)
Software development for external use (5,272) (4,225)
Purchases of property and equipment (9,268) (2,452)
Net cash used in investing activities (14,540) (6,837)
Financing Activities    
Repayment of debt and revolving credit facility (2,500) (40,000)
Proceeds from stock issuances under stock-based compensation plans 9,541 10,916
Employees' taxes paid related to restricted stock units (1,300) (1,052)
Net cash provided by (used in) financing activities 5,741 (30,136)
Effect of exchange rate changes on cash and cash equivalents 1,292 651
Net increase (decrease) in cash and cash equivalents 11,349 (8,140)
Cash and cash equivalents at beginning of period 32,424 54,488
Cash and cash equivalents at end of period 43,773 46,348
Supplemental disclosure of non-cash activities    
Unpaid purchases of property and equipment 676 865
Effect of adoption of ASU No. 2016-09, Compensation - Stock Compensation (Topic 718) $ 0 $ 1,582