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Condensed Consolidated Balance Sheets (USD $)
Mar. 31, 2015
Dec. 31, 2014
CURRENT ASSETS:    
Cash and cash equivalents $ 308,533,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 275,812,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Investment securities 46,254,000us-gaap_AvailableForSaleSecuritiesCurrent 70,952,000us-gaap_AvailableForSaleSecuritiesCurrent [1]
Cash, cash equivalents and investment securities 354,787,000us-gaap_CashCashEquivalentsAndShortTermInvestments 346,764,000us-gaap_CashCashEquivalentsAndShortTermInvestments [1]
Accounts receivable, net of allowance for doubtful accounts of $1,046 at March 31, 2015 and $1,127 at December 31, 2014 42,595,000us-gaap_AccountsReceivableNetCurrent 39,051,000us-gaap_AccountsReceivableNetCurrent [1]
Inventories 37,660,000us-gaap_InventoryNet 36,933,000us-gaap_InventoryNet [1]
Prepaid income taxes 4,941,000us-gaap_PrepaidTaxes 3,963,000us-gaap_PrepaidTaxes [1]
Prepaid expenses and other current assets 6,634,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent 5,818,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent [1]
Deferred income taxes 7,393,000us-gaap_DeferredTaxAssetsNetCurrent 4,683,000us-gaap_DeferredTaxAssetsNetCurrent [1]
Total current assets 454,010,000us-gaap_AssetsCurrent 437,212,000us-gaap_AssetsCurrent [1]
PROPERTY AND EQUIPMENT, net 82,288,000us-gaap_PropertyPlantAndEquipmentNet 86,091,000us-gaap_PropertyPlantAndEquipmentNet [1]
GOODWILL 1,478,000us-gaap_Goodwill 1,478,000us-gaap_Goodwill [1]
INTANGIBLE ASSETS, net 6,657,000us-gaap_IntangibleAssetsNetExcludingGoodwill 7,063,000us-gaap_IntangibleAssetsNetExcludingGoodwill [1]
DEFERRED INCOME TAXES 9,911,000us-gaap_DeferredTaxAssetsNetNoncurrent 9,258,000us-gaap_DeferredTaxAssetsNetNoncurrent [1]
TOTAL ASSETS 554,344,000us-gaap_Assets 541,102,000us-gaap_Assets [1]
CURRENT LIABILITIES:    
Accounts payable 12,548,000us-gaap_AccountsPayableCurrent 11,378,000us-gaap_AccountsPayableCurrent [1]
Accrued liabilities 20,349,000us-gaap_AccruedLiabilitiesCurrent 17,350,000us-gaap_AccruedLiabilitiesCurrent [1]
Total current liabilities 32,897,000us-gaap_LiabilitiesCurrent 28,728,000us-gaap_LiabilitiesCurrent [1]
DEFERRED INCOME TAXES 2,123,000us-gaap_DeferredTaxLiabilitiesNoncurrent 1,376,000us-gaap_DeferredTaxLiabilitiesNoncurrent [1]
INCOME TAX LIABILITY 1,222,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent 2,746,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent [1]
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 [1]
Common stock, $0.10 par value - Authorized-80,000 shares; Issued 15,778 shares at March 31, 2015 and 15,595 shares at December 31, 2014, outstanding 15,769 shares at March 31, 2015 and 15,595 shares at December 31, 2014 1,578,000us-gaap_CommonStockValue 1,559,000us-gaap_CommonStockValue [1]
Additional paid-in capital 118,367,000us-gaap_AdditionalPaidInCapitalCommonStock 107,336,000us-gaap_AdditionalPaidInCapitalCommonStock [1]
Treasury stock, at cost - 9 shares at March 31, 2015and 0 shares at December 31, 2014 (795,000)us-gaap_TreasuryStockValue 0us-gaap_TreasuryStockValue [1]
Retained earnings 418,597,000us-gaap_RetainedEarningsAccumulatedDeficit 408,911,000us-gaap_RetainedEarningsAccumulatedDeficit [1]
Accumulated other comprehensive income (19,645,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (9,554,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1]
Total stockholders' equity 518,102,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 508,252,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest [1]
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 554,344,000us-gaap_LiabilitiesAndStockholdersEquity 541,102,000us-gaap_LiabilitiesAndStockholdersEquity [1]
Allowance for doubtful accounts 1,046,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 1,127,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Convertible preferred stock, par value $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare $ 1.00us-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 $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 80,000,000us-gaap_CommonStockSharesAuthorized 80,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 15,778,000us-gaap_CommonStockSharesIssued 15,595,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 15,769,000us-gaap_CommonStockSharesOutstanding 15,595,000us-gaap_CommonStockSharesOutstanding
Treasury Stock, shares 9,000us-gaap_TreasuryStockShares 0us-gaap_TreasuryStockShares
[1] December 31, 2014 balances were derived from audited consolidated financial statements.