Loans Payable and Secured Line of Credit - Interest (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Loans Payable and Secured Line of Credit
Interest expense	$ 5,282	$ 4,166	$ 10,270	$ 8,137
Interest capitalized	(4,400)	(3,912)	(8,787)	(7,883)
Interest income	(1)		(1)	(4)
Interest expense, net	$ 881	$ 254	$ 1,482	$ 250

Total interest costs incurred during the period and either capitalized or charged against earnings.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

Name:	us-gaap_InterestCostsIncurred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration