Share-Based Compensation - Noncash Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total noncash share-based compensation expense	$ 4,808	$ 3,433	$ 4,212
General and administrative expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total noncash share-based compensation expense	3,466	2,075	2,563
Property management expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total noncash share-based compensation expense	$ 1,342	$ 1,358	$ 1,649