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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 305,437us-gaap_CashAndCashEquivalentsAtCarryingValue $ 288,902us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 129,594us-gaap_ShortTermInvestments 300,715us-gaap_ShortTermInvestments
Trade accounts receivable, net of allowances of $2,250 and $1,924 at December 31, 2014 and 2013, respectively 106,362us-gaap_AccountsReceivableNetCurrent 116,744us-gaap_AccountsReceivableNetCurrent
Inventories 155,169us-gaap_InventoryNet 142,727us-gaap_InventoryNet
Deferred income taxes 14,017us-gaap_DeferredTaxAssetsNetCurrent 13,428us-gaap_DeferredTaxAssetsNetCurrent
Other current assets 27,512us-gaap_OtherAssetsCurrent 16,715us-gaap_OtherAssetsCurrent
Total current assets 738,091us-gaap_AssetsCurrent 879,231us-gaap_AssetsCurrent
Property, plant and equipment, net 72,776us-gaap_PropertyPlantAndEquipmentNet 77,536us-gaap_PropertyPlantAndEquipmentNet
Long-term investments 157,201us-gaap_AvailableForSaleSecuritiesNoncurrent 60,405us-gaap_AvailableForSaleSecuritiesNoncurrent
Goodwill 192,381us-gaap_Goodwill 150,909us-gaap_Goodwill
Intangible assets, net 46,389us-gaap_FiniteLivedIntangibleAssetsNet 13,090us-gaap_FiniteLivedIntangibleAssetsNet
Other assets 17,206us-gaap_OtherAssetsNoncurrent 31,847us-gaap_OtherAssetsNoncurrent
Total assets 1,224,044us-gaap_Assets 1,213,018us-gaap_Assets
Current liabilities:    
Accounts payable 34,166us-gaap_AccountsPayableCurrent 40,074us-gaap_AccountsPayableCurrent
Accrued compensation 26,970us-gaap_EmployeeRelatedLiabilitiesCurrent 43,662us-gaap_EmployeeRelatedLiabilitiesCurrent
Income taxes payable 6,702us-gaap_AccruedIncomeTaxesCurrent 10,444us-gaap_AccruedIncomeTaxesCurrent
Other current liabilities 35,789us-gaap_OtherLiabilitiesCurrent 34,242us-gaap_OtherLiabilitiesCurrent
Total current liabilities 103,627us-gaap_LiabilitiesCurrent 128,422us-gaap_LiabilitiesCurrent
Other liabilities 38,595us-gaap_OtherLiabilitiesNoncurrent 63,073us-gaap_OtherLiabilitiesNoncurrent
Commitments and contingencies (Note 23)      
Stockholders' equity:    
Preferred Stock, $0.01 par value, 2,000,000 shares authorized; none issued and outstanding      
Common Stock, no par value, 200,000,000 shares authorized; 53,154,666 and 53,363,450 shares issued and outstanding at December 31, 2014 and 2013, respectively 113us-gaap_CommonStockValue 113us-gaap_CommonStockValue
Additional paid-in capital 734,732us-gaap_AdditionalPaidInCapitalCommonStock 730,571us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 349,061us-gaap_RetainedEarningsAccumulatedDeficit 278,966us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income/(loss) (2,084)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 11,873us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 1,081,822us-gaap_StockholdersEquity 1,021,523us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 1,224,044us-gaap_LiabilitiesAndStockholdersEquity $ 1,213,018us-gaap_LiabilitiesAndStockholdersEquity