Lease Intangibles, net - Lease Intangible Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Capital Leased Assets [Line Items]    
Less: accumulated amortization $ (176,163) $ (140,024)
Intangible lease assets, net 599,875 618,121
Below-market leases 254,034 243,237
Less: accumulated amortization (34,408) (23,123)
Intangible lease liabilities, net 219,626 220,114
In-place Leases
   
Capital Leased Assets [Line Items]    
Intangible lease assets, gross 675,926 663,027
Above-Market Lease
   
Capital Leased Assets [Line Items]    
Intangible lease assets, gross $ 100,112 $ 95,118