Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Customer relationships	$ 13,699		$ 13,699		$ 13,965
Pipeline rights-of-way	(6,588)		(6,588)		(6,208)
Intangible assets, net	7,111		7,111		7,757
Amortization of Intangible Assets	300	$ 300	600	$ 600
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Remainder of 2016	588		588
2017	1,087		1,087
2018	1,087		1,087
2019	1,087		1,087
2020	792		792
2021	639		$ 639
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			1 year	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			35 years	20 years
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Customer relationships	7,172		$ 7,172		7,551
Pipeline rights-of-way	(3,969)		(3,969)		(3,921)
Intangible assets, net	3,203		$ 3,203		3,630
Finite-Lived Intangible Asset, Useful Life			6 years 16 days
Use Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Customer relationships	6,527		$ 6,527		6,414
Pipeline rights-of-way	(2,619)		(2,619)		(2,287)
Intangible assets, net	$ 3,908		$ 3,908		$ 4,127
Finite-Lived Intangible Asset, Useful Life			5 years 2 months 20 days