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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net income from continuing operations $ 38,710 $ 21,628
Adjustments to reconcile net income from continuing operations to net cash provided by continuing operations:    
Depreciation and amortization 4,359 4,675
Deferred tax expense (benefit) 1,724 (858)
Stock-based compensation 2,726 1,840
Changes in assets and liabilities:    
Accounts receivable, net (9,021) (564)
Inventories 11,972 (5,777)
Foreign sales tax receivable 143 213
Other current assets 56 834
Accounts payable (6,240) 2,473
Income taxes payable 1,086 (966)
Accrued expenses 673 3,602
Current deferred compensation 265 411
Deferred revenue 1,382 2,526
Net cash provided by operating activities of continuing operations 47,835 30,037
Cash flows from investing activities of continuing operations:    
Purchase of short term investments (74,807) (64,916)
Maturities of short term investments 99,768 19,992
Additions to property and equipment (914) (1,212)
Additions to intangible assets (75) (112)
Other assets (3) (1,309)
Net cash provided by (used in) investing activities of continuing operations 23,969 (47,557)
Cash flows from financing activities of continuing operations:    
Proceeds from exercise of stock options 0 51
Tax payments for restricted stock issuances (837) (123)
Tax benefit of stock-based compensation 430 253
Net cash provided by (used in) financing activities of continuing operations (407) 181
Cash flows used in discontinued operations:    
Net cash used in operating activities of discontinued operations (69) (56)
Net cash used in discontinued operations (69) (56)
Effect of exchange rate changes on cash 233 (227)
Net increase (decrease) in cash 71,561 (17,622)
Cash and equivalents, beginning of year 72,441 98,607
Cash and equivalents, end of period $ 144,002 $ 80,985