Partners Capital (Class B Preferred Units) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Mezzanine equity beginning balance	$ 342,991
Distributions	7,000	$ 7,418
Total mezzanine equity	343,395		$ 342,991
Class B Preferred
Mezzanine equity beginning balance	342,991	$ 172,111	172,111
Discount			(87)
Amortization of discount	404		23,477
Distributions	9,625		39,375
Distributions paid	(9,625)		(37,168)
Transfer embedded derivative to Class B			145,283
Total mezzanine equity	$ 343,395		$ 342,991