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Consolidated Balance Sheets (USD $)
Dec. 31, 2014
Dec. 31, 2013
CURRENT ASSETS:    
Cash and cash equivalents $ 275,812,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 226,022,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Investment securities 70,952,000us-gaap_AvailableForSaleSecuritiesCurrent 70,869,000us-gaap_AvailableForSaleSecuritiesCurrent
Cash, cash equivalents and investment securities 346,764,000us-gaap_CashCashEquivalentsAndShortTermInvestments 296,891,000us-gaap_CashCashEquivalentsAndShortTermInvestments
Accounts receivable, net of allowance for doubtful accounts of $1,127 at December 31, 2014 and $1,208 at December 31, 2013 39,051,000us-gaap_AccountsReceivableNetCurrent 45,318,000us-gaap_AccountsReceivableNetCurrent
Inventories 36,933,000us-gaap_InventoryNet 34,451,000us-gaap_InventoryNet
Prepaid income taxes 3,963,000us-gaap_PrepaidTaxes 5,966,000us-gaap_PrepaidTaxes
Prepaid expenses and other current assets 5,818,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 7,319,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Deferred income taxes 4,683,000us-gaap_DeferredTaxAssetsNetCurrent 4,351,000us-gaap_DeferredTaxAssetsNetCurrent
Total current assets 437,212,000us-gaap_AssetsCurrent 394,296,000us-gaap_AssetsCurrent
PROPERTY AND EQUIPMENT, net 86,091,000us-gaap_PropertyPlantAndEquipmentNet 87,861,000us-gaap_PropertyPlantAndEquipmentNet
GOODWILL 1,478,000us-gaap_Goodwill 1,478,000us-gaap_Goodwill
INTANGIBLE ASSETS, net 7,063,000us-gaap_IntangibleAssetsNetExcludingGoodwill 8,490,000us-gaap_IntangibleAssetsNetExcludingGoodwill
DEFERRED INCOME TAXES 9,258,000us-gaap_DeferredTaxAssetsNetNoncurrent 7,518,000us-gaap_DeferredTaxAssetsNetNoncurrent
TOTAL ASSETS 541,102,000us-gaap_Assets 499,643,000us-gaap_Assets
CURRENT LIABILITIES:    
Accounts payable 11,378,000us-gaap_AccountsPayableCurrent 11,335,000us-gaap_AccountsPayableCurrent
Accrued liabilities 17,350,000us-gaap_AccruedLiabilitiesCurrent 15,551,000us-gaap_AccruedLiabilitiesCurrent
Total current liabilities 28,728,000us-gaap_LiabilitiesCurrent 26,886,000us-gaap_LiabilitiesCurrent
DEFERRED INCOME TAXES 1,376,000us-gaap_DeferredTaxLiabilitiesNoncurrent 3,630,000us-gaap_DeferredTaxLiabilitiesNoncurrent
INCOME TAX LIABILITY 2,746,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent 4,402,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
COMMITMENTS AND CONTINGENCIES 0us-gaap_CommitmentsAndContingencies 0us-gaap_CommitmentsAndContingencies
STOCKHOLDERS' EQUITY:    
Convertible preferred stock, $1.00 par value Authorized-500 shares; Issued and outstanding - none 0us-gaap_ConvertiblePreferredStockNonredeemableOrRedeemableIssuerOptionValue 0us-gaap_ConvertiblePreferredStockNonredeemableOrRedeemableIssuerOptionValue
Common stock, $0.10 par value - Authorized-80,000 shares; Issued 15,595 shares at December 31, 2014 and 15,103 shares at December 31, 2013, outstanding 15,595 shares at December 31, 2014 and 15,102 shares at December 31, 2013 1,559,000us-gaap_CommonStockValue 1,510,000us-gaap_CommonStockValue
Additional paid-in capital 107,336,000us-gaap_AdditionalPaidInCapitalCommonStock 78,495,000us-gaap_AdditionalPaidInCapitalCommonStock
Treasury stock, at cost - 0 shares at December 31, 2014 and 1 shares at December 31, 2013 0us-gaap_TreasuryStockValue (49,000)us-gaap_TreasuryStockValue
Retained earnings 408,911,000us-gaap_RetainedEarningsAccumulatedDeficit 382,576,000us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income (loss) (9,554,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 2,193,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 508,252,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 464,725,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 541,102,000us-gaap_LiabilitiesAndStockholdersEquity 499,643,000us-gaap_LiabilitiesAndStockholdersEquity
Allowance for doubtful accounts 1,127,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 1,208,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Convertible preferred stock, par value $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Convertible preferred stock, authorized shares 500,000us-gaap_PreferredStockSharesAuthorized 500,000us-gaap_PreferredStockSharesAuthorized
Convertible preferred stock, issued shares $ 0us-gaap_PreferredStockValue $ 0us-gaap_PreferredStockValue
Convertible preferred stock, outstanding shares 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.1us-gaap_CommonStockParOrStatedValuePerShare $ 0.1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 80,000,000us-gaap_CommonStockSharesAuthorized 80,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 15,595,000us-gaap_CommonStockSharesIssued 15,103,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 15,595,000us-gaap_CommonStockSharesOutstanding 15,102,000us-gaap_CommonStockSharesOutstanding
Treasury Stock, shares 0us-gaap_TreasuryStockShares 1,000us-gaap_TreasuryStockShares