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Stock Option and Incentive Plan Stock Option and Incentive Plan (Narrative) (Details) (USD $)
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0 Months Ended | 3 Months Ended | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 11, 2013
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Jan. 28, 2013
MYLTIP [Member]
indices
Y
|
Jan. 28, 2013
Cohen & Steers Realty Majors Portfolio Index [Member]
MYLTIP [Member]
|
Jan. 28, 2013
NAREIT Office Index adjusted [Member]
MYLTIP [Member]
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Jan. 28, 2013
Minimum [Member]
MYLTIP [Member]
|
Jan. 28, 2013
Maximum [Member]
MYLTIP [Member]
|
Jan. 28, 2013
Threshold [Member]
MYLTIP [Member]
|
Jan. 28, 2013
Target [Member]
MYLTIP [Member]
|
Jan. 28, 2013
High [Member]
MYLTIP [Member]
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Jan. 28, 2013
Exceptional [Member]
MYLTIP [Member]
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Jan. 28, 2013
MYLTIP Vesting 2018 [Member]
MYLTIP [Member]
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Jan. 28, 2013
MYLTIP Vesting 2017 [Member]
MYLTIP [Member]
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Jan. 28, 2013
MYLTIP Vesting 2016 [Member]
MYLTIP [Member]
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Mar. 31, 2013
Board of Directors Chairman [Member]
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Jul. 01, 2014
Board of Directors Chairman [Member]
|
Oct. 01, 2013
Board of Directors Chairman [Member]
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Mar. 11, 2013
Board of Directors Chairman [Member]
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Mar. 10, 2013
Board of Directors Chairman [Member]
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||
| TRS Measurement, Years | 3 | |||||||||||||||||
| Weighted Percentage of Index Used to Compare to TRS | 50.00% | 50.00% | ||||||||||||||||
| Potential Awards Earned | $ 0 | $ 30,700,000 | ||||||||||||||||
| Indices Used to Compare TRS | 2 | |||||||||||||||||
| Number of Tiers | 4 | |||||||||||||||||
| Amount of Each Tier | 5,100,000 | 10,200,000 | 20,500,000 | 30,700,000 | ||||||||||||||
| Percentage of annualized TRS for Reduction of Earned Awards | 2.00% | |||||||||||||||||
| Percentage to Cause Some Awards to be Earned Even if on a Relative Basis it Would Not Result in any Earned Awards | 10.00% | |||||||||||||||||
| Vesting Percentage | 50.00% | 25.00% | 25.00% | 33.33333% | 33.33333% | 33.33333% | ||||||||||||
| Vesting Date | Feb. 04, 2018 | Feb. 04, 2017 | Feb. 04, 2016 | |||||||||||||||
| Distributions Percent Before Measurement Date | 10.00% | |||||||||||||||||
| Value of MYLTIP Awards | 8,100,000 | |||||||||||||||||
| MYLTIP Value Amortized Into Earnings, Years | 5 | |||||||||||||||||
| Cash Payment Related to Transition Agreement | 6,700,000 | |||||||||||||||||
| Target Equity Award Compensation Associated with Transition Agreement | 11,100,000 | |||||||||||||||||
| Compensation Expense associated with Transition Agreement | 6,600,000 | |||||||||||||||||
| Acceleration of Stock Based Compensation in Association with Transition Agreement | $ 12,900,000 | |||||||||||||||||