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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income from continuing operations $ 27,523 $ 10,419
Adjustments to reconcile net income from continuing operations to net cash provided by continuing operations:    
Depreciation and amortization 2,929 3,168
Deferred tax expense (benefit) 1,415 (973)
Stock-based compensation 1,677 1,211
Changes in assets and liabilities:    
Accounts receivable, net (12,411) 6,368
Inventories 3,589 (40)
Foreign sales tax receivable 283 134
Other current assets (22) 581
Accounts payable (4,577) 3,992
Income taxes payable 223 (1,598)
Accrued expenses (923) 2,466
Deferred compensation (244) 60
Deferred revenue 364 1,277
Net cash provided by operating activities of continuing operations 19,826 27,065
Cash flows from investing activities of continuing operations:    
Purchase of short term investments (74,807) (29,972)
Maturities of short term investments 64,847 0
Additions to property and equipment (727) (964)
Additions to intangible assets (49) (88)
Other assets (18) (1,326)
Net cash used in investing activities of continuing operations (10,754) (32,350)
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 430 121
Net cash provided by (used in) financing activities of continuing operations (407) 49
Cash flows used in discontinued operations:    
Net cash used in operating activities of discontinued operations (63) (54)
Net cash used in discontinued operations (63) (54)
Effect of exchange rate changes on cash 1,067 25
Net increase in cash 9,669 (5,265)
Cash and equivalents, beginning of year 72,441 98,607
Cash and equivalents, end of period $ 82,110 $ 93,342