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Acquisitions Acquisitions - Pro Forma (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Business Acquisition [Line Items]  
Revenues $ 34,381us-gaap_BusinessAcquisitionsProFormaRevenue
Net income $ 7,461us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income per limited partner unit:  
Basic (in dollars per share) $ 0.37us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Diluted (in dollars per share) $ 0.37us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted