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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Acquistiion consideration accrued as goodwill and accrued liabilities $ 0 $ (1,482)
Cash flows from operating activities:    
Net income 17,156 10,646
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13,732 9,247
Loss on disposal of fixed assets 289 28
Asset Impairment Charges 1,759 0
Provision for (recovery of) receivable allowance 110 410
Share-based compensation expense 8,387 6,781
Income tax benefits from employee stock plans 1,707 1,638
Excess tax benefits from employee stock plans (2,827) (2,336)
Provision for excess and obsolete inventories 911 509
Deferred income taxes (737) (1,084)
Changes in operating assets and liabilities:    
Accounts receivable, net (9,004) (7,103)
Inventories (4,713) 2,924
Prepaid expenses (1,661) (3,453)
Other current assets (394) 921
Net investment in sales-type leases 1,313 (1,493)
Other assets 307 (13)
Accounts payable 6,462 2,131
Accrued compensation 1,263 802
Accrued liabilities 2,031 (1,719)
Deferred service revenue (403) 2,117
Deferred gross profit 4,434 5,377
Other long-term liabilities 615 1,147
Net cash provided by operating activities 40,737 27,477
Cash flows from investing activities:    
Maturities of short-term investments 0 8,122
Acquisition of intangible assets and intellectual property (225) (303)
Software development for external use (5,694) (3,118)
Purchases of property and equipment (7,817) (9,560)
Business acquisition, net of cash acquired 0 (156,312)
Net cash used in investing activities (13,736) (161,171)
Cash flows from financing activities:    
Proceeds from issuance of common stock under employee stock purchase and stock option plans 24,020 6,777
Stock repurchases 0 (12,363)
Excess tax benefits from employee stock plans 2,827 2,336
Net cash provided from financing activities 26,847 (3,250)
Effect of exchange rate changes on cash and cash equivalents 29 0
Net (decrease) increase in cash and cash equivalents 53,877 (136,944)
Cash and cash equivalents at beginning of period 62,313 191,762
Cash and cash equivalents at end of period $ 116,190 $ 54,818