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Accounts Receivable (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Roll-forward activity of allowance for doubtful accounts      
Balance at beginning of period $ 1,132us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1,305us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1,078us-gaap_AllowanceForDoubtfulAccountsReceivable
Less: Reduction in (provision for) allowances (96)us-gaap_ProvisionForDoubtfulAccounts 159us-gaap_ProvisionForDoubtfulAccounts (383)us-gaap_ProvisionForDoubtfulAccounts
Less: Write offs, net of recoveries 49us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 14us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 156us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance at end of period $ 1,179us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1,132us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1,305us-gaap_AllowanceForDoubtfulAccountsReceivable