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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 47,874 $ 45,160
Short-term investments 135,289 105,105
Accounts receivable, less reserves of $1,134 and $1,131 in 2013 and 2012, respectively 45,215 42,387
Inventories 26,653 26,182
Deferred income taxes 6,371 6,369
Prepaid expenses and other current assets 15,777 14,394
Total current assets 277,179 239,597
Long-term investments 243,108 238,255
Property, plant, and equipment, net 35,343 34,820
Deferred income taxes 17,820 15,647
Intangible assets, net 12,849 14,770
Goodwill 81,689 81,689
Other assets 2,388 2,827
Total assets 670,376 627,605
Current liabilities:    
Accounts payable 7,157 6,815
Accrued expenses 28,279 29,590
Accrued income taxes 208 1,009
Deferred revenue and customer deposits 13,479 12,690
Total current liabilities 49,123 50,104
Reserve for income taxes 6,255 5,216
Commitments and contingencies (Note 8)      
Shareholders' equity:    
Common stock, $.002 par value - Authorized: 140,000 shares, issued: 43,497 and 43,055 shares in 2013 and 2012, respectively 87 86
Additional paid-in capital 190,444 165,248
Retained earnings 456,978 436,466
Accumulated other comprehensive loss, net of tax (32,511) (29,515)
Total shareholders' equity 614,998 572,285
Total liabilities and shareholders' equity $ 670,376 $ 627,605