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Debt (Details) - USD ($)	1 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt
Basis Spread of Variable Rate, LIBOR, Minimum		25.00%
Amount of interest costs incurred, capitalized, and expensed
Interest costs incurred		$ 2,796,000	$ 2,172,000	$ 1,224,000
Less: Interest capitalized		(512,000)	(144,000)	(160,000)
Interest expense		$ 2,284,000	$ 2,028,000	1,064,000
LIBOR | Minimum
Debt
Credit facility, interest rate spread (as a percent)		80.00%
LIBOR | Maximum
Debt
Credit facility, interest rate spread (as a percent)		165.00%
Base rate | Minimum
Debt
Credit facility, interest rate spread (as a percent)		20.00%
Base rate | Maximum
Debt
Credit facility, interest rate spread (as a percent)		65.00%
Primary Revolving Credit Facility
Debt
Total outstanding balances				$ 800
Long-term Debt		$ 900,000
Line of Credit Facility, Fair Value of Amount Outstanding		303,800,000
Primary Revolving Credit Facility | Wells Fargo Bank
Debt
Line of Credit Facility, Maximum Borrowing Capacity		$ 300,000,000.0
Proceeds from Unsecured Lines of Credit	$ 150,000,000.0
Primary Revolving Credit Facility | Minimum | Wells Fargo Bank
Debt
Facility fees on the available commitment of the facility (as a percent)		20.00%
Primary Revolving Credit Facility | Maximum | Wells Fargo Bank
Debt
Facility fees on the available commitment of the facility (as a percent)		35.00%
Cisco Systems Capital Corporation | Minimum
Debt
Debt Instrument, Interest Rate, Stated Percentage			2.89%
Cisco Systems Capital Corporation | Maximum
Debt
Debt Instrument, Interest Rate, Stated Percentage			3.50%

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Contractual interest rate for funds borrowed, under the debt agreement.

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