Share-Based Compensation and Other Compensation Matters (Details 1) - USD ($) $ in Thousands  | 
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016  | 
Dec. 31, 2015  | 
Dec. 31, 2014  | 
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| Share-Based Compensation | |||
| Share-based compensation cost | $ 7,453 | $ 7,398 | $ 7,050 | 
| General, adminstrative and leasing expenses [Member] | |||
| Share-Based Compensation | |||
| Share-based compensation cost | 5,816 | 5,574 | 5,307 | 
| Property operating expenses [Member] | |||
| Share-Based Compensation | |||
| Share-based compensation cost | 1,027 | 1,000 | 857 | 
| Capitalized to development activities [Member] | |||
| Share-Based Compensation | |||
| Share-based compensation cost | $ 610 | $ 824 | $ 886 | 
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 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. No definition available. 
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