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Summary of Significant Accounting Policies - Real Estate and Depreciation, In-place Leases (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value | $ 32,093 | $ 31,991 |
Accumulated Amortization | 22,336 | 19,293 |
Net | 9,757 | 12,698 |
Amortization | 20,636 | 15,360 | 7,643
Leases, Acquired-in-Place [Member] |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2013 | 17,382 |  |
2014 | 14,837 |  |
2015 | 12,228 |  |
2016 | 8,984 |  |
2017 | 5,548 |  |
Tenant origination costs [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value | 58,444 | 55,640 |
Accumulated Amortization | 32,839 | 25,479 |
Net | 25,605 | 30,161 |
Leasing commissions and absorbtion costs [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value | 90,327 | 86,705 |
Accumulated Amortization | 48,163 | 34,738 |
Net | 42,164 | 51,967 |
Net lease intangible assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value | 14,794 | 14,422 |
Accumulated Amortization | 7,665 | 5,679 |
Net | 7,129 | 8,743 |
Below-market ground lease [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value | 12,080 | 12,080 |
Accumulated Amortization | 956 | 766 |
Net | $ 11,124 | $ 11,314 |

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