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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating Activities    
Net income (loss) $ 9,308 $ (8,455)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 24,829 25,942
Loss on disposal of fixed assets 0 79
Share-based compensation expense 13,766 11,056
Income tax benefits from employee stock plans 0 11
Deferred income taxes (6,655) (11,722)
Amortization of debt financing fees 1,145 795
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable and unbilled receivables 15,476 (1,058)
Inventories (9,789) (12,226)
Prepaid expenses 2,126 128
Other current assets (2,283) 202
Investment in sales-type leases (1,838) 5,482
Prepaid commissions 2,812 1,554
Other long-term assets (2,797) (622)
Accounts payable (12,229) 23,357
Accrued compensation 3,927 4,529
Accrued liabilities (2,574) 2,165
Deferred revenues 5,336 (3,412)
Other long-term liabilities 167 1,119
Net cash provided by operating activities 40,727 38,924
Investing Activities    
Purchases of intangible assets, intellectual property, and patents 0 (160)
Software development for external use (13,091) (6,748)
Purchases of property and equipment (14,985) (6,493)
Business acquisitions, net of cash acquired 0 (4,446)
Net cash used in investing activities (28,076) (17,847)
Financing Activities    
Proceeds from debt 0 10,000
Repayment of debt and revolving credit facility (12,500) (70,500)
Proceeds from stock issuances under stock-based compensation plans 16,117 15,783
Employees’ taxes paid related to restricted stock units (3,062) (2,638)
Net cash provided by (used in) financing activities 555 (47,355)
Effect of exchange rate changes on cash and cash equivalents 538 (1,274)
Net increase (decrease) in cash and cash equivalents 13,744 (27,552)
Cash and cash equivalents at beginning of period 32,424 54,488
Cash and cash equivalents at end of period 46,168 26,936
Supplemental disclosure of non-cash activities    
Unpaid purchases of property and equipment 892 641
Inventory transferred to property and equipment 2,194 0
Effect of adoption of ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718)” $ 0 $ 1,582