Revenue from Contracts with Customers (Contract with Customer, Asset and Liability) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Adoption of ASC606 [Line Items]
Contract liability	$ 7,061	$ 9,881
Change in contact assets and liabilities, net	(2,577)	(4,970)	$ 0
Mid-Stream
Adoption of ASC606 [Line Items]
Contract Assets	12,921	13,164
Change in contract assets	(243)
Contract liability	7,061	9,881
Change in contract liabilities	(2,820)
Contract assets (liabilities), net	5,860	3,283
Change in contact assets and liabilities, net	$ (2,577)	$ (5,000)