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Stock Option and Incentive Plan Stock Option and Incentive Plan (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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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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Mar. 11, 2013
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Jan. 28, 2013
MYLTIP [Member]
indices
Y
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Jan. 28, 2013
Cohen & Steers Realty Majors Portfolio Index [Member]
MYLTIP [Member]
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Jan. 28, 2013
NAREIT Office Index adjusted [Member]
MYLTIP [Member]
|
Jan. 28, 2013
Minimum [Member]
MYLTIP [Member]
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Jan. 28, 2013
Maximum [Member]
MYLTIP [Member]
|
Jan. 28, 2013
Threshold [Member]
MYLTIP [Member]
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Jan. 28, 2013
Target [Member]
MYLTIP [Member]
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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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Jun. 30, 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] | ||||||||||||||||||||
| Allocated Share-based Compensation Expense | $ 6,400,000 | $ 6,400,000 | $ 31,900,000 | $ 17,400,000 | ||||||||||||||||
| 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% | ||||||||||||||||
| Vesting Date | Feb. 04, 2018 | Feb. 04, 2017 | Feb. 04, 2016 | |||||||||||||||||
| Distributions Percent Before Measurement Date | 10.00% | |||||||||||||||||||
| Value of MYLTIP Awards | 9,200,000 | |||||||||||||||||||
| 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 | 9,200,000 | |||||||||||||||||||
| Acceleration of Stock Based Compensation in Association with Transition Agreement | $ 12,900,000 | |||||||||||||||||||