Annual report pursuant to Section 13 and 15(d)

Income taxes - U.S. statutory income tax rate to the Company's effective tax rate (Details)

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Income taxes - U.S. statutory income tax rate to the Company's effective tax rate (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
U.S. statutory income tax rate to the Company's effective tax rate [Abstract]      
Federal tax at statutory rate 21.00% 21.00% 21.00%
State and local income tax (net of federal tax benefit) 0.37% 0.60% 0.70%
Income Passed Through to Limited Partners (19.46%) (20.40%) (20.70%)
Other 0.07% 0.00% 0.00%
Effective tax rate 1.98% 1.20% 1.00%