Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Date the equity-based award expires, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Net number of share options (or share units) granted during the period.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Long-Term Incentive Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2008	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Long-Term Incentive Plan
Amortization related to shares issued to design and construction employees				$ 356	$ 450
Restricted Shares
Long-Term Incentive Plan
Amortization Expense, including forfeitures		$ 1,848	$ 1,539	$ 6,188	$ 5,616
Restricted Shares \| Minimum
Long-Term Incentive Plan
Vesting period				3 years
Restricted Shares \| Maximum
Long-Term Incentive Plan
Vesting period				5 years
Stock Options \| Former Chairman
Stock options
Number of nonqualified stock options approved by the compensation committee of the Company's board of directors (in shares)	200,000
Exercise price of outstanding options (in dollars per share)		$ 17.71		$ 17.71
Expiration date of outstanding options	Apr. 27, 2018