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Real estate (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Real Estate Properties [Line Items]      
Land and land improvements $ 1,267,605 $ 1,262,381  
Buildings and improvements 1,922,738 1,964,267  
Less: accumulated depreciation and amortization (405,539) (427,625)  
Real estate, net 2,784,804 2,799,023 2,799,023
Real estate available and held for sale 599,061 635,865 635,865
Total real estate 3,383,865 3,434,888 3,434,888
Net Lease Assets
     
Real Estate Properties [Line Items]      
Land and land improvements 342,221 344,239  
Buildings and improvements 1,285,058 1,295,081  
Less: accumulated depreciation and amortization (318,479) (315,699)  
Real estate, net 1,308,800 1,323,621  
Real estate available and held for sale 9,766 0  
Total real estate 1,318,566 1,323,621  
Operating Properties
     
Real Estate Properties [Line Items]      
Land and land improvements 132,028 132,028  
Buildings and improvements 637,680 669,186  
Less: accumulated depreciation and amortization (84,504) (109,634)  
Real estate, net 685,204 691,580  
Real estate available and held for sale 409,579 454,587  
Total real estate 1,094,783 1,146,167  
Land
     
Real Estate Properties [Line Items]      
Land and land improvements 793,356 786,114  
Buildings and improvements 0 0  
Less: accumulated depreciation and amortization (2,556) (2,292)  
Real estate, net 790,800 783,822  
Real estate available and held for sale 179,716 181,278  
Total real estate $ 970,516 $ 965,100