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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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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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Long-Term Incentive Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2008	Mar. 31, 2017	Mar. 31, 2016
Long-Term Incentive Plan
Amortization related to shares issued to design and construction employees		$ 151	$ 239
Restricted Shares
Long-Term Incentive Plan
Amortization Expense, including forfeitures		1,749	1,614
Amortization related to shares issued to design and construction employees		$ 200	$ 200
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