Long-Term Incentive Plan Units (Roll-Forward Of Company's LTIP Units Outstanding) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Director LTIP Units exercised	(2,801)	(2,475)	(2,801)	(2,475)
Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding, beginning of period	469,539	449,938	469,539	449,938
Granted	10,002	8,403	10,002	8,403
Director LTIP Units exercised	(2,801)	(2,475)	(2,801)	(2,475)
LTIP Units Outstanding, end of period	476,740	455,866	476,740	455,866
LTIP Units Vested and Outstanding	446,430	426,070	446,430	426,070
Manager [Member] | Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding, beginning of period	375,000	375,000	375,000	375,000
Granted	0	0	0	0
Director LTIP Units exercised	0	0	0	0
LTIP Units Outstanding, end of period	375,000	375,000	375,000	375,000
LTIP Units Vested and Outstanding	375,000	375,000	375,000	375,000
Non-Manager [Member] | Long-Term Incentive Plan Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
LTIP Units Outstanding, beginning of period	94,539	74,938	94,539	74,938
Granted	10,002	8,403	10,002	8,403
Director LTIP Units exercised	(2,801)	(2,475)	(2,801)	(2,475)
LTIP Units Outstanding, end of period	101,740	80,866	101,740	80,866
LTIP Units Vested and Outstanding	71,430	51,070	71,430	51,070