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Net Income per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share Basic [Line Items]    
Net income and comprehensive income $ 62,009 $ 49,306
Less: Net income and comprehensive income attributable to noncontrolling interest   846
Less: Preacquisition income allocated to general partner   31,388
Net income and comprehensive income attributable to partners 62,009 17,072
Less: Incentive distribution rights 19,566 1,449
Less: Distributions on nonvested phantom unit awards 931 310
Limited partners' interest in net income 41,512 15,313
Common Units [Member]    
Earnings Per Share Basic [Line Items]    
Limited partners' interest in net income $ 38,078 $ 10,532
Weighted average limited partner units outstanding 87,453,333 24,099,177
Weighted average limited partner units outstanding, Equivalents 21,354 37,671
Weighted average limited partner units outstanding, Diluted 87,474,687 24,136,848
Common (basic and diluted) $ 0.47 $ 0.44
Subordinated Units [Member]    
Earnings Per Share Basic [Line Items]    
Limited partners' interest in net income   $ 4,781
Weighted Average Number of Subordinated Units Outstanding, Basic and Diluted   10,939,436
Common (basic and diluted)   $ 0.44