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Summary Of Significant Accounting Policies (Allowance For Doubtful Account) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary Of Significant Accounting Policies [Abstract]      
Beginning balance $ 686us-gaap_FinancingReceivableAllowanceForCreditLosses $ 246us-gaap_FinancingReceivableAllowanceForCreditLosses $ 135us-gaap_FinancingReceivableAllowanceForCreditLosses
Provision for doubtful accounts 338us-gaap_ProvisionForDoubtfulAccounts 770us-gaap_ProvisionForDoubtfulAccounts 330us-gaap_ProvisionForDoubtfulAccounts
Write-offs, net of recoveries (135)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (330)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs (219)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Ending balance $ 889us-gaap_FinancingReceivableAllowanceForCreditLosses $ 686us-gaap_FinancingReceivableAllowanceForCreditLosses $ 246us-gaap_FinancingReceivableAllowanceForCreditLosses