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Accounts Receivable - Components of Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts Receivable    
Accounts receivable, gross $ 56,994us-gaap_AccountsReceivableGrossCurrent $ 62,797us-gaap_AccountsReceivableGrossCurrent
Allowance For Doubtful Accounts Receivable Current 100us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 130us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net $ 56,894us-gaap_AccountsReceivableNetCurrent $ 62,667us-gaap_AccountsReceivableNetCurrent