Long-Term Incentive Plan Units (Roll-Forward of Company's LTIP Units Outstanding) (Details) - Long-Term Incentive Plan Units [Member] - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding, beginning of period	545,716	521,371	491,159
Granted	70,460	37,437	33,546
Exercised	(3,638)	(13,092)	(3,334)
LTIP Units Outstanding, end of period	612,538	545,716	521,371
OP LTIP Units Unvested and Outstanding end of period	75,550	46,128
OP LTIP Units Vested and Outstanding end of period	536,988	499,588	481,939
Manager [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding, beginning of period	365,518	375,000	375,000
Granted	0	0	0
Exercised	0	(9,482)	0
LTIP Units Outstanding, end of period	365,518	365,518	375,000
OP LTIP Units Unvested and Outstanding end of period	0	0
OP LTIP Units Vested and Outstanding end of period	365,518	365,518	375,000
Non-Manager [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding, beginning of period	180,198	146,371	116,159
Granted	70,460	37,437	33,546
Exercised	(3,638)	(3,610)	(3,334)
LTIP Units Outstanding, end of period	247,020	180,198	146,371
OP LTIP Units Unvested and Outstanding end of period	75,550	46,128
OP LTIP Units Vested and Outstanding end of period	171,470	134,070	106,939