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Related Parties - Balance Sheet related to Medallion (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]    
Accounts receivable, net $ 110,003us-gaap_AccountsReceivableNetCurrent $ 126,929us-gaap_AccountsReceivableNetCurrent
Other assets, net 8,510us-gaap_OtherAssetsNoncurrent 8,675us-gaap_OtherAssetsNoncurrent
Other current liabilities 73,048us-gaap_OtherLiabilitiesCurrent 101,032us-gaap_OtherLiabilitiesCurrent
Medallion Gathering And Processing LLC    
Related Party Transaction [Line Items]    
Accounts receivable, net 97us-gaap_AccountsReceivableNetCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpi_MedallionGatheringAndProcessingLlcMember
0us-gaap_AccountsReceivableNetCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpi_MedallionGatheringAndProcessingLlcMember
Other assets, net 1,209us-gaap_OtherAssetsNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpi_MedallionGatheringAndProcessingLlcMember
1,110us-gaap_OtherAssetsNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpi_MedallionGatheringAndProcessingLlcMember
Other current liabilities $ 4,264us-gaap_OtherLiabilitiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpi_MedallionGatheringAndProcessingLlcMember
$ 3,443us-gaap_OtherLiabilitiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= lpi_MedallionGatheringAndProcessingLlcMember