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Summary of Significant Accounting Policies - Deferred Leasing Incentives (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deferred Leasing Incentives [Line Items]      
Amortization of deferred leasing incentives $ 789 $ 664 $ 208
Gross Carrying Value Deferred Leasing Incentives [Member]
      
Deferred Leasing Incentives [Line Items]      
Gross Carrying Value 6,578 4,651  
Accumulated Amortization Deferred Leasing Incentives [Member]
      
Deferred Leasing Incentives [Line Items]      
Accumulated Amortization 1,698 909  
Net Deferred Leasing Incentives [Member]
      
Deferred Leasing Incentives [Line Items]      
Net $ 4,880 $ 3,742