Capital and Accumulated Other Comprehensive Loss - Narrative (Details) - USD ($)			3 Months Ended		6 Months Ended		12 Months Ended
	May 18, 2020	Feb. 06, 2020	Jun. 30, 2020	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 07, 2016	Jan. 02, 2012
Class of Stock [Line Items]
Common units, units outstanding (in shares)			24,929,253		24,929,253		25,023,128
Preferred Stock, Liquidation Preference Per Share		$ 25	$ 25		$ 25
Incentive units granted, percentage of outstanding common units									100.00%
Class A
Class of Stock [Line Items]
Common units, units outstanding (in shares)			24,929,253		24,929,253
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		$ 2,725,000	$ 5,945,000
Debt Instrument, Term					9 years
Repurchase period in force				60 days
Units redeemed (in shares)		1,600,000
Additional redemption price (dollars per share)		$ 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
Minimum
Class of Stock [Line Items]
Vesting period					3 years
Maximum
Class of Stock [Line Items]
Vesting period					10 years