CONSOLIDATED CONDENSED STATEMENTS OF UNITHOLDERS' EQUITY (Unaudited) (Parentheticals) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Common units, shares authorized (in shares)		500,000,000	500,000,000
Balance as of period date		$ 315,851	$ 303,382	$ 906,769	$ 893,306
Retained Earnings
Balance as of period date		$ 117,681	$ 106,539	$ 733,291	713,129
Cumulative Effect, Period of Adoption, Adjustment
Balance as of period date	[1]				(7,159)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Balance as of period date	[1]				$ 6,962

[1] 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.