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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 247,666 $ 384,557
Short-term investments 322,488 192,234
Restricted cash 2,850 2,017
Accounts receivable, net 37,769 63,169
Inventories 57,585 59,807
Prepaid expenses and other current assets 36,864 32,155
Deferred income taxes 10,545 10,545
Total current assets 715,767 744,484
Property, plant and equipment at cost, net 95,698 98,302
Goodwill 55,828 55,828
Deferred income taxes 6,072 935
Intangible assets, net 18,407 20,974
Other assets 17,341 16,781
Total assets 909,113 937,304
Current liabilities:    
Accounts payable 28,334 26,087
Accrued expenses and other current liabilities 60,283 74,260
Deferred revenue 8,032 9,380
Income taxes payable 974 2,292
Current portion of long-term debt 285 268
Total current liabilities 97,908 112,287
Deferred income taxes 7,110 7,137
Long-term debt 1,922 2,138
Other liabilities 4,894 4,530
Total liabilities 111,834 126,092
Equity:    
Preferred stock, 500,000 shares authorized; no shares issued and outstanding      
Common stock; $.01 par value; authorized 120,000,000 shares; 39,247,833 and 39,328,503 shares issued and outstanding in 2013 and 2012, respectively 392 393
Additional paid-in capital 716,370 708,723
Retained earnings 75,945 96,123
Accumulated other comprehensive income 4,572 5,973
Total equity 797,279 811,212
Total liabilities and equity $ 909,113 $ 937,304