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Long-Term Incentive Plan (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
Long-Term Incentive Plan (Details) - USD ($) $ in Thousands	Apr. 30, 2008	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Long-Term Incentive Plan
Capitalized compensation cost related to shares issued to design and construction employees				$ 214	$ 309
Stock options
Number of stock options outstanding		0		0
Restricted Shares
Long-Term Incentive Plan
Amortization Expense, including forfeitures		$ 2,865	$ 2,591	$ 4,865	4,340
Capitalized compensation cost related to shares issued to design and construction employees		$ 100	$ 200	$ 200	$ 300
Restricted Shares \| Minimum
Long-Term Incentive Plan
Vesting period		3 years
Restricted Shares \| Maximum
Long-Term Incentive Plan
Vesting period		4 years
Stock Options \| Former Chairman
Stock options
Number of options granted (in shares)	200,000
Expiration date of outstanding options	Apr. 01, 2018