Inventory (Inventory) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Refined petroleum products	$ 67,055	$ 57,455	$ 67,055
Liquefied petroleum gases	37,642	17,954	37,642
Transmix	36,867	21,297	36,867
Crude oil	10,015	28,385	10,015
Additives	6,183	5,777	6,183
Total inventory	157,762	130,868	157,762
Lower-of-cost-or-market inventory adjustment	$ 39,300	$ 5,000	$ 39,300