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Accounts Receivable Allowance for Doubtful Accounts (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]      
Balance, beginning of year $ 3,755us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,693us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,807us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Provisions 5,191us-gaap_ProvisionForDoubtfulAccounts 2,741us-gaap_ProvisionForDoubtfulAccounts 977us-gaap_ProvisionForDoubtfulAccounts
Charges (3,120)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (1,679)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (1,091)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance, end of year $ 5,826us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 3,755us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,693us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent