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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 40,644 $ 45,160
Short-term investments 184,822 105,105
Accounts receivable, less reserves of $1,354 and $1,131 in 2013 and 2012, respectively 53,015 42,387
Inventories 25,694 26,182
Deferred income taxes 7,611 6,369
Prepaid expenses and other current assets 20,265 14,394
Total current assets 332,051 239,597
Long-term investments 229,655 238,255
Property, plant, and equipment, net 37,136 34,820
Deferred income taxes 12,307 15,647
Intangible assets, net 14,723 14,770
Goodwill 81,689 81,689
Other assets 2,138 2,827
Total assets 709,699 627,605
Current liabilities:    
Accounts payable 9,487 6,815
Accrued expenses 34,331 29,590
Accrued income taxes 1,263 1,009
Deferred revenue and customer deposits 15,941 12,690
Total current liabilities 61,022 50,104
Reserve for income taxes 4,765 5,216
Commitments and contingencies (Note 10)      
Shareholders' equity:    
Common stock, $.002 par value - Authorized: 140,000 shares, issued and outstanding: 86,831 and 86,110 shares in 2013 and 2012, respectively 174 [1] 172 [1]
Additional paid-in capital 211,440 [1] 165,162 [1]
Retained earnings 462,131 [1] 436,466 [1]
Accumulated other comprehensive loss, net of tax (29,833) [1] (29,515) [1]
Total shareholders' equity 643,912 [1] 572,285 [1]
Total liabilities and shareholders' equity $ 709,699 $ 627,605
[1] Prior period amounts have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend which occurred in the third quarter of 2013.