Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Long-Term Incentive Plan (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Long-Term Incentive Plan (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Compensation Expense and Forfeitures
Capitalized compensation cost related to shares issued to design and construction employees			$ 376	$ 304
Restricted Shares
Compensation Expense and Forfeitures
Amortization Expense, including forfeitures	$ 2,238	$ 2,146	7,509	7,168
Capitalized compensation cost related to shares issued to design and construction employees	$ 100	$ 100	$ 400	$ 300
Restricted Shares \| Minimum
Long-Term Incentive Plan
Vesting period			3 years