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Commitments and Contingencies Legal Proceedings (Details)
 12 Months Ended
Dec. 31, 2014
Plaintiff
Loss Contingencies [Line Items]  
Number of open bankruptcy claims 1frp_BankruptcyClaimsNumberOfClaimsOpen
IntraMTA  
Loss Contingencies [Line Items]  
Number of plantiffs 2us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationCaseAxis
= frp_IntraMTAMember
Pending litigation  
Loss Contingencies [Line Items]  
Number of pending claims 16us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
Pending litigation | IntraMTA  
Loss Contingencies [Line Items]  
Number of pending claims 60us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationCaseAxis
= frp_IntraMTAMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember