Related Party Transactions (Indirect Charges) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 20,996	$ 18,013	$ 41,520	$ 36,094
General and Administrative Expense [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	3,063	2,346	6,081	4,461
Operating Expense [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 17,933	$ 15,667	$ 35,439	$ 31,633