CONSOLIDATED CONDENSED STATEMENTS OF UNITHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	[2]	Manager	Total Unitholders’ Equity	Total Unitholders’ Equity Cumulative Effect, Period of Adoption, Adjustment	[2]	Total Unitholders’ Equity Manager	Special Units	Common Units		Common Units Manager	Common Units Paid In Capital	Common Units Paid In Capital Cumulative Effect, Period of Adoption, Adjustment	[2]	Common Units Paid In Capital Manager	Accumulated Other Comprehensive Loss	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	[2]	Noncontrolling Interests
Beginning balance, special units (in shares) at Dec. 31, 2020										100
Beginning balance, common units (in shares) at Dec. 31, 2020	[1]										87,361,929
Beginning balance at Dec. 31, 2020		$ 893,306	$ (7,159)			$ 885,016	$ (7,159)							$ 178,062	$ (14,121)			$ (6,175)	$ 713,129	$ 6,962		$ 8,290
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of units to Manager (in shares)	[1]												142,936
Issuance of units to Manager					$ 4,650				$ 4,650								$ 4,650
Unit vested under compensation plans (in shares)	[1],[3]										952
Unit withheld for taxes on vested stock (in shares)	[1],[3]										(365)
Unit-based compensation expense		2,175				2,175								2,175
Comprehensive income, net of taxes		13,797				13,200													13,200			597
Ending balance, special units (in shares) at Mar. 31, 2021										100
Ending balance, common units (in shares) at Mar. 31, 2021	[1]										87,505,452
Ending balance at Mar. 31, 2021		$ 906,769				897,882								170,766				(6,175)	733,291			8,887
Beginning balance, special units (in shares) at Dec. 31, 2021		100								100
Beginning balance, common units (in shares) at Dec. 31, 2021		88,343,762									88,343,762	[1]
Beginning balance at Dec. 31, 2021		$ 303,382				294,904								193,471				(5,106)	106,539			8,478
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of units to Manager (in shares)	[1]												217,696
Issuance of units to Manager					$ 787				$ 787								$ 787
Unit vested under compensation plans (in shares)	[1],[3]										356,124
Unit withheld for taxes on vested stock (in shares)	[1],[3]										(112,063)
Unit-based compensation expense		236				236								236
Comprehensive income, net of taxes		$ 11,446				11,142													11,142			304
Ending balance, special units (in shares) at Mar. 31, 2022		100								100
Ending balance, common units (in shares) at Mar. 31, 2022		88,805,519									88,805,519	[1]
Ending balance at Mar. 31, 2022		$ 315,851				$ 307,069								$ 194,494				$ (5,106)	$ 117,681			$ 8,782

[1] The Company is authorized to issue 500,000,000 common units.

[2] On January 1, 2021, the Company adopted ASU No. 2020-06, Debt - Debt with Conversion and Other Options, using the modified retrospective method and made an adjustment to the beginning balance to Retained Earnings of $7.0 million, net of taxes. See Note 8, “Long-Term Debt”, for further discussions.

[3] Units vested and issued under the 2016 Omnibus Employee Incentive Plan and 2014 Independent Directors' Equity Plan. Under the 2016 Omnibus Employee Incentive Plan, units are withheld for the employee portion of taxes on vested awards and are available for future grants. See Note 10, "Unitholders' Equity", for further discussions.