Share-Based Compensation - Aggregate LTIP Units Issued to Board of Directors (Details) - Director - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Mar. 31, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
LTIP Units			0
2015 Equity Incentive Plan
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Grant Date	2019-01
Grant Date Fair Value per Share	$ 21.15
Aggregate Fair Value	$ 480
Vesting Date	2020-01
2015 Equity Incentive Plan | LTIP Units
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Grant Date		2018-01
LTIP Units		28,952
Grant Date Fair Value per Share		$ 18.61
Aggregate Fair Value		$ 539
Vesting Date		2019-01