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Significant Accounting Policies (Narrative) (Details) (USD $)
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3 Months Ended |
6 Months Ended |
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Jun. 30, 2013
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Dec. 31, 2012
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Jul. 03, 2013
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Jan. 04, 2013
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| Significant Accounting Policies [Line Items] |
|
|
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| Capitalized development and construction salaries and other related costs |
$ 900,000 |
|
$ 900,000 |
$ 1,700,000 |
$ 1,800,000 |
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| Rental property in-progress |
92,400,000 |
107,600,000 |
|
92,400,000 |
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|
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| Maximum period after cessation of major construction activity that projects are considered complete |
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|
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1 year |
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|
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| Consolidated joint ventures, total real estate assets |
198,100,000 |
198,300,000 |
|
198,100,000 |
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|
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| Consolidated joint ventures, mortgages |
78,900,000 |
77,100,000 |
|
78,900,000 |
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|
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| Consolidated joint ventures, other liabilities |
15,700,000 |
16,500,000 |
|
15,700,000 |
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|
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| Amortization of deferred financing costs |
809,000 |
|
661,000 |
1,582,000 |
1,272,000 |
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| Write off of unamortized deferred financing costs |
0 |
|
370,000 |
0 |
370,000 |
|
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| Deferred leasing costs |
1,033,000 |
|
1,060,000 |
2,206,000 |
2,156,000 |
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| Income taxes, material adjustment amount |
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|
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0 |
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| Common stock, shares outstanding |
88,004,354 |
87,536,292 |
|
88,004,354 |
|
87,748,884 |
87,537,250 |
| Common units outstanding |
12,003,241 |
12,141,836 |
|
12,003,241 |
|
12,003,241 |
12,141,836 |
| Common stock dividends and common unit distributions per share |
|
$ 0.45 |
|
$ 0.30 |
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|
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| Restricted stock expense |
981,000 |
|
579,000 |
2,014,000 |
1,393,000 |
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| Difference between other comprehensive income and net income |
0 |
|
0 |
0 |
0 |
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| Accumulated other comprehensive income |
$ 0 |
|
$ 0 |
$ 0 |
$ 0 |
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Fourth Quarter 2012 [Member]
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| Significant Accounting Policies [Line Items] |
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| Distributions payable, record date |
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Jan.
04,
2013 |
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| Common stock dividends and common unit distributions payable, date |
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Jan. 11,
2013 |
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Second Quarter 2013 [Member]
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| Significant Accounting Policies [Line Items] |
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| Distributions payable, record date |
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Jul.
03,
2013 |
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| Common stock dividends and common unit distributions payable, date |
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Jul. 12,
2013 |
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