Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Customer relationships	$ 13,699		$ 13,699		$ 13,965
Pipeline rights-of-way	(6,886)		(6,886)		(6,208)
Intangible assets, net	6,813		6,813		7,757
Amortization of Intangible Assets	300	$ 300	900	$ 900
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Remainder of 2016	289		289
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	(4,102)		(4,102)		(3,921)
Intangible assets, net	3,070		$ 3,070		3,630
Finite-Lived Intangible Asset, Useful Life			5 years 1 month 24 days
Use Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Customer relationships	6,527		$ 6,527		6,414
Pipeline rights-of-way	(2,784)		(2,784)		(2,287)
Intangible assets, net	$ 3,743		$ 3,743		$ 4,127
Finite-Lived Intangible Asset, Useful Life			5 years 9 months 15 days