Notes Payable, Revolving Credit Facility, Interest and Amortization of Deferred Debt Costs - Interest Expense and Amortization of Deferred Debt Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Disclosure [Abstract]
Interest incurred	$ 12,837	$ 12,988	$ 25,856	$ 25,868
Amortization of deferred debt costs	387	375	760	760
Capitalized interest	(1,137)	(2,522)	(4,905)	(4,668)
Interest expense	12,087	10,841	21,711	21,960
Less: Interest income	68	48	98	100
Interest expense, net and amortization of deferred debt costs	$ 12,019	$ 10,793	$ 21,613	$ 21,860