Partners' Capital (Details) $ / shares in Units, $ in Thousands					1 Months Ended			3 Months Ended					9 Months Ended
	May 22, 2017 shares	Feb. 20, 2017 shares	Jan. 25, 2017 $ / shares shares	Oct. 14, 2015 USD ($) $ / shares shares	Apr. 30, 2017 USD ($) shares	Nov. 30, 2016 USD ($) shares	Aug. 31, 2015	Jun. 30, 2017 shares	Mar. 31, 2017 shares	Dec. 31, 2016 shares	Sep. 30, 2016 shares	Dec. 31, 2015	Sep. 30, 2017 USD ($) shares	Dec. 06, 2016 shares	Mar. 31, 2016
Limited Partners' Capital Account [Line Items]
Class B preferred units, outstanding										29,296,441			31,000,887
Units, outstanding										13,447,749			14,773,192
Class A preferred units converted to common shares, conversion ratio															1
Units, issued										13,447,749			14,773,192
Proceeds from common units sold | $													$ 1,290
Class B preferred units, issued										29,296,441			31,000,887
IPO
Limited Partners' Capital Account [Line Items]
Units, issued						6,745,107
Proceeds from common units sold | $						$ 69,700
Private Placement
Limited Partners' Capital Account [Line Items]
Units, issued						2,272,727
Proceeds from common units sold | $						$ 25,000
Over-Allotment Option
Limited Partners' Capital Account [Line Items]
Units, issued						194,305
Class A Preferred Units
Limited Partners' Capital Account [Line Items]
Reverse stock split ratio							0.10
Class B Preferred
Limited Partners' Capital Account [Line Items]
Class B preferred units, outstanding													31,000,887
Units, issued														9,851,996
Units sold (in units)	184,697	208,594		19,444,445
Price per unit sold | $ / shares				$ 18.00
Proceeds from preferred units sold | $				$ 350,000
Percent of consideration paid				2.25%
Paid in full in cash, per annum												10.00%
Paid in part cash, per annum												12.00%
Dividend per annum												8.00%
Paid-in kind per annum												4.00%
Class B Preferred | Settlement Agreement with Stonepeak Catarina Holdings LLC
Limited Partners' Capital Account [Line Items]
Class B preferred units, issued			1,704,446
Class B preferred units, unit price | $ / shares			$ 11.29
Common Units
Limited Partners' Capital Account [Line Items]
Units, outstanding													14,773,192
Units, issued					84,577
Units sold (in units)								170,497	139,110	154,737	170,750
Proceeds from common units sold | $					$ 1,300
Common units authorized for sale, value | $					$ 50,000
Minimum | Class B Preferred
Limited Partners' Capital Account [Line Items]
Preferred unit conversion, amount | $													$ 17,500