Fair Values (Schedule of Fair Value Measurement) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) land_asset
Assets and liabilities recorded at fair value
Derivative liabilities	$ 19,000	$ 8,700
Recurring basis | Fair Value
Assets and liabilities recorded at fair value
Derivative assets		114
Derivative liabilities	18,926	8,680
Available-for-sale securities	25,274	23,896
Recurring basis | Level 1
Assets and liabilities recorded at fair value
Derivative assets		0
Derivative liabilities	0	0
Available-for-sale securities	0	0
Recurring basis | Level 2
Assets and liabilities recorded at fair value
Derivative assets		114
Derivative liabilities	18,926	8,680
Available-for-sale securities	0	0
Recurring basis | Level 3
Assets and liabilities recorded at fair value
Derivative assets		0
Derivative liabilities	0	0
Available-for-sale securities	25,274	23,896
Non-recurring basis
Assets and liabilities recorded at fair value
Impaired land and development, aggregate impairment	1,300	$ 5,300
Impaired land and development, number of assets | land_asset		2
Non-recurring basis | Fair Value
Assets and liabilities recorded at fair value
Impaired land and development	6,078	$ 40,000
Non-recurring basis | Level 1
Assets and liabilities recorded at fair value
Impaired land and development	0	0
Non-recurring basis | Level 2
Assets and liabilities recorded at fair value
Impaired land and development	0	0
Non-recurring basis | Level 3
Assets and liabilities recorded at fair value
Impaired land and development	$ 6,078	$ 40,000