Long-Term Incentive Plan Units (Roll-Forward of Company's LTIP Units Outstanding) (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Exercised	0	0
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	521,371	491,159
Granted	0	1,723
Exercised	0	0
LTIP Units Outstanding, end of period	521,371	492,882
OP LTIP Units Unvested and Outstanding end of period	37,709
OP LTIP Units Vested and Outstanding (3/31/19)	483,662	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
Exercised	0	0
LTIP Units Outstanding, end of period	375,000	375,000
OP LTIP Units Unvested and Outstanding end of period	0
OP LTIP Units Vested and Outstanding (3/31/19)	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	146,371	116,159
Granted	0	1,723
Exercised	0	0
LTIP Units Outstanding, end of period	146,371	117,882
OP LTIP Units Unvested and Outstanding end of period	37,709
OP LTIP Units Vested and Outstanding (3/31/19)	108,662	86,155