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Summary of Significant Accounting Policies - Revenue Recognition (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Accounting Policies [Abstract] |  |
Straight-line rent adjustments | $ 34.6us-gaap_StraightLineRentAdjustments | $ 30.9us-gaap_StraightLineRentAdjustments

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- Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of the adjustment to rental revenues to measure escalating leasing revenues on a straight line basis. + References No definition available. + Details
Name: | us-gaap_StraightLineRentAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration