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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 17,478 $ 11,019
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of fixed and intangible assets 7,046 6,733
Amortization of other long term assets 1,574 1,934
Amortization of discounted liabilities 396 988
Stock-based compensation 1,031 1,031
Tax benefit from exercise of stock options (160)  
Changes in assets and liabilities associated with operations:    
Increase in net receivables (3,862) (41,019)
Increase in inventories (8,854) (6,566)
Increase in prepaid expenses and other assets (2,555) (1,791)
Decrease in income tax receivable/payable, net 393 8,133
Increase in accounts payable 668 9,089
Decrease in deferred revenue (7,370) (5,474)
Increase in other liabilities 30,883 18,220
Net cash provided by operating activities 36,668 2,297
Cash flows from investing activities:    
Capital expenditures (13,061) (2,322)
Net cash used in investing activities (13,061) (2,322)
Cash flows from financing activities:    
Net repayments borrowings under line of credit agreement   (7,300)
Principal payments on long-term debt (4,000) (4,004)
Tax benefit from exercise of stock options 160  
Borrowings on long-term debt   20,063
Decrease in other notes payable (6,827)  
Payment of cash dividends (1,380) (826)
Proceeds from the issuance of common stock (sale of stock under ESPP and exercise of stock option) 1,285 550
Net cash (used in) provided by financing activities (10,762) 8,483
Net increase in cash 12,845 8,458
Cash and cash equivalents at beginning of year 35,085 1,158
Effect of exchange rate changes on cash 118 342
Cash and cash equivalents as of June 30 $ 48,048 $ 9,958