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Noncontrolling Interest - LTIP Units (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended			6 Months Ended		12 Months Ended
	Jan. 07, 2021	Feb. 13, 2020	Jan. 08, 2020	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
LTIP Units
Units
Unvested at beginning of period (in shares)					211,448		211,448	227,348	227,348
Granted	153,430				278,806		405,844
Vested (in units)				(45,335)	(294,706)	(43,958)	(228,821)	(174,145)
Forfeited (in units)					0		0
Unvested at end of period (in shares)				388,471			388,471		211,448
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 27.74			$ 27.74		$ 26.54	$ 23.37
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 28.13						28.13		29.47
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value							$ 27.33		26.87
Unrecognized compensation costs				$ 4,100			$ 4,100
Unrecognized compensation costs, period for recognition							2 years 3 months 18 days
Vested (in units)				45,335	294,706	43,958	228,821	174,145
Fair value of units vested				$ 1,686		$ 1,213	$ 7,369	$ 5,074
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value							$ 0		$ 0
Restricted stock
Units
Unvested at beginning of period (in shares)					184,890		184,890	193,045	193,045
Granted					75,419		90,304
Vested (in units)				0	(81,408)	0	(72,788)	(78,010)
Forfeited (in units)					(2,166)		(521)
Unvested at end of period (in shares)				201,885			201,885		184,890
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 28.96			$ 28.96		$ 27.70	$ 24.38
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 29.77	$ 32.64	$ 31.49				29.77		31.60
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value							$ 26.76		23.46
Unrecognized compensation costs				$ 4,400			$ 4,400
Unrecognized compensation costs, period for recognition							2 years 7 months 6 days
Vested (in units)				0	81,408	0	72,788	78,010
Fair value of units vested				$ 0		$ 0	$ 2,280	$ 2,463
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value							$ 28.06		$ 26.92

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