Long-Term Incentive Plan Units (Roll-Forward Of Company's LTIP Units Outstanding) (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Director LTIP Units exercised	(3,334)	(2,801)	(3,334)	(2,801)
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	492,882	469,539	491,159	469,539
Granted	14,440	10,002	16,163	10,002
Director LTIP Units exercised	(3,334)	(2,801)	(3,334)	(2,801)
LTIP Units Outstanding, end of period	503,988	476,740	503,988	476,740
LTIP Units Vested and Outstanding	467,823	446,430	467,823	446,430
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	117,882	94,539	116,159	94,539
Granted	14,440	10,002	16,163	10,002
Director LTIP Units exercised	(3,334)	(2,801)	(3,334)	(2,801)
LTIP Units Outstanding, end of period	128,988	101,740	128,988	101,740
LTIP Units Vested and Outstanding	92,823	71,430	92,823	71,430