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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 36,826 $ 22,068 $ 10,984
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization of fixed and intangible assets 13,487 13,546 11,123
Amortization of other long term assets 2,925 1,983 3,258
Amortization of discounted liabilities 818 1,371  
Stock-based compensation 2,950 1,994 1,122
Tax benefit from exercise of stock options (621)    
(Decrease)increase in deferred income taxes (886) 4,711 5,342
Changes in assets and liabilities associated with operations:      
(Increase) decrease in net receivables (7,505) (35,021) 6,967
(Increase) decrease in inventories (16,883) 2,986 (1,542)
Decrease (increase) in income tax receivable/payable, net 2,137 6,512 (2,583)
Increase in prepaid expenses and other assets (23,725) (1,823) (2,235)
Increase in accounts payable 9,781 8,384 3,095
Increase in deferred revenue 12,856 2,003 5,568
Increase (decrease) in other payables and accrued expenses 8,264 10,552 (7,909)
Net cash provided by operating activities 40,424 39,266 33,190
Cash flows from investing activities:      
Capital expenditures (17,628) (6,261) (8,004)
Acquisitions of intangible assets (3,473) (316) (32,677)
Net cash used in investing activities (21,101) (6,577) (40,681)
Cash flows from financing activities:      
Net (repayments) borrowings under line of credit agreement   (7,300) 4,700
Payments on long-term debt (8,443) (8,429) (8,107)
Payment on other long-term liabilities (6,035) (401)  
Tax benefit from exercise of stock options 621    
Increase in other notes payable (51) 20,063 11,586
Proceeds from the issuance of common stock (sale of stock under ESPP and exercise of stock options) 3,227 580 768
Non-controlling interest contribution 400    
Payment of cash dividends (6,148) (2,205) (819)
Net cash (used in) provided by financing activities (16,429) 2,308 8,128
Net increase in cash 2,894 34,997 637
Effect of exchange rate changes on cash 497 (1,070) 138
Cash at beginning of year 35,085 1,158 383
Cash at end of year 38,476 35,085 1,158
Cash paid during the year for:      
Interest 1,891 2,055 3,661
Income taxes 18,048 6,359 2,205
Supplemental schedule of non-cash investing and financing activities:      
Product Line Acquisitions   316 32,677
Payments for product line acquisitions in current year     20,655
Additions to intangible assets and related liabilities $ 1,073 $ 6,802