Long-Term Incentive Plan Units (Roll-Forward Of Company's LTIP Units Outstanding) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 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)
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	491,159	469,539
Granted	33,546	24,421
Director LTIP Units exercised	(3,334)	(2,801)
LTIP Units Outstanding, end of period	521,371	491,159
LTIP Units Vested and Outstanding	481,939	461,155
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
Granted	0	0
Director LTIP Units exercised	0	0
LTIP Units Outstanding, end of period	375,000	375,000
LTIP Units Vested and Outstanding	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	116,159	94,539
Granted	33,546	24,421
Director LTIP Units exercised	(3,334)	(2,801)
LTIP Units Outstanding, end of period	146,371	116,159
LTIP Units Vested and Outstanding	106,939	86,155