v2.4.0.6

Summary of Significant Accounting Policies (Intangible Assets) (Details) (Favorable Lease Rates) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items] |  |
Favorable lease rates, original useful lives | 35 years 4 months 24 days | 36 years 4 months 24 days
Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Favorable lease rates, original useful lives | 41 years |
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Favorable lease rates, original useful lives | 52 years |

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

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration