Partners Capital (Class B Preferred Units) (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Mezzanine equity beginning balance	$ 342,991
Distributions	14,000	$ 16,168
Total mezzanine equity	342,953		$ 342,991
Class B Preferred
Mezzanine equity beginning balance	342,991	$ 172,111	172,111
Discount			(87)
Amortization of discount	837		23,477
Distributions	18,375		39,375
Distributions paid	(19,250)		(37,168)
Transfer embedded derivative to Class B			145,283
Total mezzanine equity	$ 342,953		$ 342,991