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Allowance for Doubtful Accounts, Sales Returns and Discounts (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance at beginning of year $ 15,359us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 15,186us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 15,186us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Charges to earnings 554us-gaap_ProvisionForDoubtfulAccounts 173us-gaap_ProvisionForDoubtfulAccounts 0us-gaap_ProvisionForDoubtfulAccounts
Amounts utilized (15,186)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 0us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 0us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance at end of year $ 727us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 15,359us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 15,186us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent