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(Narratives)(Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]        
U.S. federal statutory tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Operating Loss Carryforwards [Line Items]        
Valuation allowance $ 1,100,000us-gaap_OperatingLossCarryforwardsValuationAllowance $ 1,500,000us-gaap_OperatingLossCarryforwardsValuationAllowance    
Accumulated net earning 154,562,000us-gaap_RetainedEarningsAccumulatedDeficit 146,199,000us-gaap_RetainedEarningsAccumulatedDeficit    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 1,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 1,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Gross deferred tax assets 28,400,000us-gaap_DeferredTaxAssetsGross 27,900,000us-gaap_DeferredTaxAssetsGross    
Gross deferred tax liabilities 76,100,000us-gaap_DeferredIncomeTaxLiabilities 58,800,000us-gaap_DeferredIncomeTaxLiabilities    
Uncertain tax positions 1,434,000us-gaap_UnrecognizedTaxBenefits 1,439,000us-gaap_UnrecognizedTaxBenefits 376,000us-gaap_UnrecognizedTaxBenefits 251,000us-gaap_UnrecognizedTaxBenefits
Internal Revenue Service (IRS) [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 0us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		      
State        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 5,300,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Foreign Tax Authority [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 6,300,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		      
Accumulated net earning $ 15,500,000us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember