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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Statement of Cash Flows [Abstract]    
Acquistiion consideration accrued as goodwill and accrued liabilities   $ 0
Cash flows from operating activities:    
Net income 21,282 17,156
Adjustments to reconcile net income to net cash provided by operating activities, net of business acquisition    
Depreciation and amortization 14,705 13,732
Loss on disposal of fixed assets 221 289
Impairment of software development costs 0 1,759
Provision for receivable allowance 850 110
Share-based compensation expense 8,610 8,387
Income tax benefits from employee stock plans 4,065 1,707
Excess tax benefits from employee stock plans (4,456) (2,827)
Provision for excess and obsolete inventories 450 911
Deferred income taxes 1,307 (737)
Changes in operating assets and liabilities:    
Accounts receivable, net (35,028) (9,004)
Inventories 1,301 (4,713)
Prepaid expenses 1,015 (1,661)
Other current assets 1,412 (394)
Non-current net investment in sales-type leases 677 1,313
Other assets 360 307
Accounts payable 5,420 6,462
Accrued compensation (6,533) 1,263
Accrued liabilities (416) 2,031
Deferred service revenue 2,650 (403)
Deferred gross profit 15,585 4,434
Other long-term liabilities 838 615
Net cash provided by operating activities 34,315 40,737
Cash flows from investing activities:    
Acquisition of intangible assets and intellectual property (236) (225)
Software development for external use (7,925) (5,694)
Purchases of property and equipment (10,151) (7,817)
Business acquisition, net of cash acquired (19,749) 0
Net cash used in investing activities (38,061) (13,736)
Cash flows from financing activities:    
Proceeds from issuances under stock-based compensation plans 18,157 24,020
Employees' taxes paid related to restricted stock units (2,023) 0
Common stock repurchases (17,052) 0
Excess tax benefits from employee stock plans 4,456 2,827
Net cash provided by financing activities 3,538 26,847
Effect of exchange rate changes on cash and cash equivalents (136) 29
Net increase (decrease) in cash and cash equivalents (344) 53,877
Cash and cash equivalents at beginning of period 104,531 62,313
Cash and cash equivalents at end of period $ 104,187 $ 116,190