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Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Changes in the allowance for doubtful accounts      
Balance, beginning of year $ 872us-gaap_AllowanceForDoubtfulAccountsReceivable $ 714us-gaap_AllowanceForDoubtfulAccountsReceivable $ 571us-gaap_AllowanceForDoubtfulAccountsReceivable
Charged to provision for doubtful accounts 481us-gaap_ProvisionForDoubtfulAccounts 570us-gaap_ProvisionForDoubtfulAccounts 512us-gaap_ProvisionForDoubtfulAccounts
Write-offs (506)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (412)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (369)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance, end of year $ 847us-gaap_AllowanceForDoubtfulAccountsReceivable $ 872us-gaap_AllowanceForDoubtfulAccountsReceivable $ 714us-gaap_AllowanceForDoubtfulAccountsReceivable