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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 287,090 $ 288,902
Short-term investments 306,513 300,715
Trade accounts receivable, net 119,463 116,744
Inventories 147,511 142,727
Deferred income taxes 16,053 13,428
Other current assets 17,552 16,715
Assets classified as held for sale 1,427  
Total current assets 895,609 879,231
Property, plant and equipment, net 75,517 77,536
Long-term investments 53,620 60,405
Goodwill 151,112 150,909
Intangible assets, net 12,519 13,090
Other assets 34,383 31,847
Total assets 1,222,760 1,213,018
Current liabilities:    
Accounts payable 35,385 40,074
Accrued compensation 35,763 43,662
Income taxes payable 8,620 10,444
Other current liabilities 36,442 34,242
Total current liabilities 116,210 128,422
Other liabilities 60,782 63,073
Commitments and contingencies (Note 18)      
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; 53,456,493 and 53,363,450 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively 113 113
Additional paid-in capital 732,741 730,571
Retained earnings 301,147 278,966
Accumulated other comprehensive income 11,767 11,873
Total stockholders' equity 1,045,768 1,021,523
Total liabilities and stockholders' equity $ 1,222,760 $ 1,213,018