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Subsequent Events Distribution Declaration (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 24, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Subsequent Event [Line Items]          
Cash distributions per limited partner unit   $ 0.705 $ 0.630 $ 1.395 $ 1.240
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Quarterly distributions declared $ 21,783        
Cash distributions per limited partner unit $ 0.705