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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 13,983 $ 9,401
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 9,391 9,244
Loss on disposal of fixed assets 202 141
Impairment of software development costs 0 1,759
Provision for receivable allowance 436 63
Share-based compensation expense 5,449 5,613
Income tax benefits from employee stock plans 3,058 739
Excess tax benefits from employee stock plans (3,326) (1,258)
Provision for excess and obsolete inventories 250 742
Deferred income taxes 860 (258)
Changes in operating assets and liabilities:    
Accounts receivable, net (24,408) (8,757)
Inventories (335) (199)
Prepaid expenses 2,144 (536)
Other current assets 1,602 94
Non-current net investment in sales-type leases 622 160
Other assets 228 (129)
Accounts payable 2,494 (796)
Accrued compensation (3,910) (374)
Accrued liabilities 2,424 2,065
Deferred service revenue 2,640 (1,294)
Deferred gross profit 10,788 4,578
Other long-term liabilities 829 230
Net cash provided by operating activities 25,421 21,228
Cash flows from investing activities:    
Acquisition of intangible assets and intellectual property (191) (64)
Software development for external use (5,507) (3,194)
Purchases of property and equipment (7,335) (5,711)
Net cash used in investing activities (13,033) (8,969)
Cash flows from financing activities:    
Proceeds from issuances under stock-based compensation plans 11,813 11,549
Employees' taxes paid related to restricted stock units (1,729) 0
Common stock repurchases (4,069) 0
Excess tax benefits from employee stock plans 3,326 1,258
Net cash provided by financing activities 9,341 12,807
Effect of exchange rate changes on cash and cash equivalents 119 (45)
Net increase in cash and cash equivalents 21,848 25,021
Cash and cash equivalents at beginning of period 104,531 62,313
Cash and cash equivalents at end of period $ 126,379 $ 87,334