Equity Incentive Plan - Equity Non-cash Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
General and Administrative Expenses
Equity Incentive Plan
Share-based compensation	$ 2,938	$ 2,537	$ 5,790	$ 4,815
Restricted stock | General and Administrative Expenses
Equity Incentive Plan
Share-based compensation	481	444	948	871
LTIP Units | General and Administrative Expenses
Equity Incentive Plan
Share-based compensation	978	899	1,942	1,786
Performance shares | General and Administrative Expenses
Equity Incentive Plan
Share-based compensation	1,341	1,096	2,648	1,955
Independent Director | General and Administrative Expenses
Equity Incentive Plan
Share-based compensation	$ 138	$ 98	$ 252	$ 203
Common Stock | Independent Director
Equity Incentive Plan
Number of days of average trailing stock price used to calculate number of shares of common stock granted			10 days	10 days