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Summary of Significant Accounting Policies - Trade Receivables (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Allowance for doubtful accounts, beginning balance $ 2,027us-gaap_AllowanceForDoubtfulAccountsReceivable $ 2,491us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1,885us-gaap_AllowanceForDoubtfulAccountsReceivable
Charged to revenues, costs and expenses 1,705us-gaap_ProvisionForDoubtfulAccounts 1,043us-gaap_ProvisionForDoubtfulAccounts 1,717us-gaap_ProvisionForDoubtfulAccounts
Amounts charged off, net (1,596)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (1,507)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (1,111)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Allowance for doubtful accounts, ending balance $ 2,136us-gaap_AllowanceForDoubtfulAccountsReceivable $ 2,027us-gaap_AllowanceForDoubtfulAccountsReceivable $ 2,491us-gaap_AllowanceForDoubtfulAccountsReceivable