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Real Estate (Schedule of Real Estate Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Real Estate Properties [Line Items]    
Land and land improvements $ 1,286,989 $ 1,262,381
Buildings and improvements 1,933,645 1,855,024
Less: accumulated depreciation and amortization (424,453) (378,306)
Real estate, net 2,796,181 2,739,099
Real estate available and held for sale 360,517 635,865
Total real estate 3,156,698 3,374,964
Net Lease
   
Real Estate Properties [Line Items]    
Land and land improvements 350,817 344,239
Buildings and improvements 1,346,071 1,282,571
Less: accumulated depreciation and amortization (338,640) (310,605)
Real estate, net 1,358,248 1,316,205
Real estate available and held for sale 0 0
Total real estate 1,358,248 1,316,205
Operating Properties
   
Real Estate Properties [Line Items]    
Land and land improvements 132,934 132,028
Buildings and improvements 587,574 572,453
Less: accumulated depreciation and amortization (82,420) (65,409)
Real estate, net 638,088 639,072
Real estate available and held for sale 228,328 454,587
Total real estate 866,416 1,093,659
Land
   
Real Estate Properties [Line Items]    
Land and land improvements 803,238 786,114
Buildings and improvements 0 0
Less: accumulated depreciation and amortization (3,393) (2,292)
Real estate, net 799,845 783,822
Real estate available and held for sale 132,189 181,278
Total real estate $ 932,034 $ 965,100