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Real Estate (Schedule of real estate assets) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Real Estate Properties [Line Items]    
Land and land improvements $ 1,283,508 $ 1,262,381
Buildings and improvements 1,940,659 1,964,267
Less: accumulated depreciation and amortization (438,732) (427,625)
Real estate, net 2,785,435 2,799,023
Real estate available and held for sale 410,080 635,865
Total real estate 3,195,515 3,434,888
Net Lease
   
Real Estate Properties [Line Items]    
Land and land improvements 335,598 344,239
Buildings and improvements 1,295,419 1,295,081
Less: accumulated depreciation and amortization (335,301) (315,699)
Real estate, net 1,295,716 1,323,621
Real estate available and held for sale 0 0
Total real estate 1,295,716 1,323,621
Operating Properties
   
Real Estate Properties [Line Items]    
Land and land improvements 132,608 132,028
Buildings and improvements 645,240 669,186
Less: accumulated depreciation and amortization (100,325) (109,634)
Real estate, net 677,523 691,580
Real estate available and held for sale 262,332 454,587
Total real estate 939,855 1,146,167
Land
   
Real Estate Properties [Line Items]    
Land and land improvements 815,302 786,114
Buildings and improvements 0 0
Less: accumulated depreciation and amortization (3,106) (2,292)
Real estate, net 812,196 783,822
Real estate available and held for sale 147,748 181,278
Total real estate $ 959,944 $ 965,100