Capital and Accumulated Other Comprehensive Loss - Narrative (Details)				3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 01, 2020 USD ($) shares	May 18, 2020 shares	Feb. 06, 2020 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Mar. 31, 2020 shares	Jun. 30, 2019	Sep. 30, 2020 USD ($) day $ / shares shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 07, 2016 USD ($)	Jan. 02, 2012
Class of Stock [Line Items]
Common units, units outstanding (in shares)				25,189,613			25,189,613		25,023,128
Preferred Stock, Liquidation Preference Per Share | $ / shares			$ 25	$ 25			$ 25
Incentive units granted, percentage of outstanding common units											100.00%
Number Of Days Prior To Measurement Date | day							20
Common Unit, Weighted Average Price Per Share | $ / shares				$ 19.65			$ 19.65
Class A
Class of Stock [Line Items]
Common units, units outstanding (in shares)				25,189,613			25,189,613
Common Units
Class of Stock [Line Items]
Authorized amount | $										$ 3,000,000
Units issued in the acquisition of WFHC noncontrolling interests (in shares)							2,089,177
Units issued in acquisition of WFHC noncontrolling interests | $							$ 33,881,000
Series A Preferred Units
Class of Stock [Line Items]
Stated interest rate				6.00%			6.00%
Preferred unit dividend | $				$ 2,371,000			$ 5,133,000	$ 8,918,000
Debt Instrument, Term							9 years
Repurchase period in force						60 days
Units redeemed (in shares)			1,600,000
Additional redemption price (dollars per share) | $ / shares			$ 0.22
Redemption payment | $			$ 40,400,000
Preferred units outstanding				6,422,128			6,422,128		7,927,288
2018 Incentive Award Plan
Class of Stock [Line Items]
Additional shares authorized (in shares)		500,000
Shares authorized		1,000,000
Shares granted (in shares)					207,499
Unearned compensation expense | $									$ 2,905,000
RSUs granted (in shares)	240,900
Unearned compensation | $	$ 1,780,000
Minimum
Class of Stock [Line Items]
Vesting period							3 years
Minimum | 2018 Incentive Award Plan | Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Vesting period							2 years
Maximum
Class of Stock [Line Items]
Vesting period							10 years
Maximum | 2018 Incentive Award Plan | Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Vesting period							3 years