XML 28 R67.htm IDEA: XBRL DOCUMENT v2.4.1.9
Related Party Transactions - Transactions with NGL Energy (Details) (NGL Energy [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
NGL Energy [Member]
   
Related Party Transaction    
Revenues $ 45,469us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= semg_NglEnergyMember
$ 172,438us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= semg_NglEnergyMember
Related Party Transaction, Purchases from Related Party 35,234us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= semg_NglEnergyMember
157,691us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= semg_NglEnergyMember
Related Party Transaction Reimbursements from Transactions With Related Party $ 42semg_RelatedPartyTransactionReimbursementsFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= semg_NglEnergyMember
$ 42semg_RelatedPartyTransactionReimbursementsFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= semg_NglEnergyMember