Common and Preferred Unit Distributions Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Temporary Equity [Line Items]
Income attributable to preferred unitholders	$ 7,500	$ 7,500
Class A Convertible Preferred Units
Temporary Equity [Line Items]
Dividends, Preferred Stock, Paid-in-Kind, Cash Redemption Payment	$ 0	$ 8,844
General Partner
Temporary Equity [Line Items]
General partner's general partner distribution	2.00%
Common unitholders and general partner
Temporary Equity [Line Items]
Distribution per common unit (in dollars per share)	$ 0.45	$ 0.45
Preferred Stock | Preferred Partner
Temporary Equity [Line Items]
Distribution per common unit (in dollars per share)	$ 30.00	$ 30.00