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Noncontrolling Interests In Subsidiaries (Narrative) (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Noncontrolling Interest [Line Items] | |||
| Preferred stock issued | $ 25,000,000 | ||
| Increase in noncontrolling interest | (107,000) | (321,000) | 3,186,000 |
| Rebalance of ownership percentage | 9,400,000 | ||
| Percentage of noncontrolling interest | 12.20% | 14.00% | |
| Square footage of office buildings | 860,246 | ||
| Excess net cash flow remaining after the distribution to the Company | 50.00% | ||
| Internal rate of return | 10.00% | ||
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Series C Preferred Stock [Member]
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| Noncontrolling Interest [Line Items] | |||
| Preferred unit in operating partnership | 25,000,000 | ||
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Series C Cumulative Redeemable Perpetual Preferred Stock [Member]
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| Noncontrolling Interest [Line Items] | |||
| Preferred stock issued | $ 25,000,000 | ||