Long-Term Incentive Plan Units (Roll-Forward Of Company's LTIP Units Outstanding) (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Director LTIP Units exercised	2,475	1,947	1,822
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	449,938	429,314	411,052
Granted	22,076	22,571	20,084
Director LTIP Units exercised	2,475	1,947	1,822
LTIP Units Outstanding, end of period	469,539	449,938	429,314
LTIP Units Vested and Outstanding	440,828	421,120	404,859
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
Granted	0	0	0
Director LTIP Units exercised	0	0	0
LTIP Units Outstanding, end of period	375,000	375,000	375,000
LTIP Units Vested and Outstanding	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	74,938	54,314	36,052
Granted	22,076	22,571	20,084
Director LTIP Units exercised	2,475	1,947	1,822
LTIP Units Outstanding, end of period	94,539	74,938	54,314
LTIP Units Vested and Outstanding	65,828	46,120	29,859