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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Disclosure [Abstract]
Interest incurred	$ 12,933	$ 13,103	$ 38,788	$ 38,972
Amortization of deferred debt costs	402	370	1,163	1,130
Capitalized interest	(909)	(3,088)	(5,813)	(7,756)
Interest expense	12,426	10,385	34,138	32,346
Less: Interest income	28	60	127	161
Interest expense, net and amortization of deferred debt costs	$ 12,398	$ 10,325	$ 34,011	$ 32,185