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Significant Accounting Policies (Narrative) (Details) (USD $)
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3 Months Ended |
12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2013
property
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Dec. 31, 2012
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Dec. 31, 2011
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Jan. 06, 2014
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Jan. 04, 2013
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Dec. 31, 2010
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| Significant Accounting Policies [Abstract] |
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| Capitalized development and construction salaries and other related costs |
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$ 4,400,000 |
$ 3,800,000 |
$ 3,700,000 |
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| Construction, tenant improvement, and development in-progress |
40,800,000 |
107,600,000 |
40,800,000 |
107,600,000 |
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| Number of properties placed into service |
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2 |
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| Maximum period after cessation of major construction activity that projects are considered complete |
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1 year |
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| Threshold of investment value for discontinuation of equity method accounting |
0 |
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0 |
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| Amortization of deferred financing costs |
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3,172,000 |
2,669,000 |
2,370,000 |
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| Write off of unamortized deferred financing costs |
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156,000 |
593,000 |
0 |
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| Deferred leasing costs |
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4,223,000 |
4,354,000 |
4,432,000 |
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| Deferred tax asset |
13,100,000 |
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13,100,000 |
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| Income taxes, material adjustment amount |
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0 |
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| Common stock, shares outstanding |
88,247,591 |
87,536,292 |
88,247,591 |
87,536,292 |
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87,928,002 |
87,537,250 |
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| Common units outstanding |
11,864,775 |
12,141,836 |
11,864,775 |
12,141,836 |
12,197,122 |
11,864,775 |
12,141,836 |
13,007,668 |
| Distributions payable, record date |
Jan.
06,
2014 |
Jan.
04,
2013 |
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| Common stock dividends and common unit distributions per share |
$ 0.30 |
$ 0.45 |
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| Dividends paid per common share |
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$ 1.50 |
$ 1.80 |
$ 1.80 |
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| Dividends paid, percent representing ordinary income |
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53.00% |
75.00% |
77.00% |
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| Dividends paid, percent representing return of capital to shareholders |
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33.00% |
25.00% |
23.00% |
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| Dividends paid, percent representing capital gain |
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14.00% |
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| Stock compensation |
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2,387,000 |
3,642,000 |
4,123,000 |
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| Common stock dividends and common unit distributions payable, date |
Jan. 15,
2014 |
Jan. 11,
2013 |
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| Difference between other comprehensive income and net income |
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0 |
0 |
0 |
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| Accumulated other comprehensive income |
$ 0 |
$ 0 |
$ 0 |
$ 0 |
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