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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 $ 235,724 $ 287,588
Short-term investments 346,715 327,653
Trade accounts receivable, net 95,771 82,060
Inventories 137,006 134,639
Deferred income taxes 8,046 8,194
Other current assets 38,426 28,048
Total current assets 861,688 868,182
Property, plant and equipment, net 78,875 80,516
Long-term investments 15,788 12,158
Goodwill 150,012 150,733
Intangible assets, net 12,523 11,561
Other assets 11,461 11,692
Total assets 1,130,347 1,134,842
Current liabilities:    
Accounts payable 24,302 16,803
Accrued compensation 19,318 20,955
Income taxes payable 3,269 4,148
Other current liabilities 32,697 37,405
Total current liabilities 79,586 79,311
Other liabilities 46,693 43,375
Commitments and contingencies (Note 17)      
Stockholders' equity:    
Preferred Stock, $0.01 par value per share, 2,000,000 shares authorized; none issued and outstanding      
Common Stock, no par value, 200,000,000 shares authorized; 53,153,412 and 52,748,849 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively 113 113
Additional paid-in capital 723,360 718,005
Retained earnings 273,296 278,583
Accumulated other comprehensive income 7,299 15,455
Total stockholders' equity 1,004,068 1,012,156
Total liabilities and stockholders' equity $ 1,130,347 $ 1,134,842