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Real Estate (Schedule of Real Estate Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Real Estate Properties [Line Items]    
Land and land improvements $ 1,309,587 $ 1,286,989
Buildings and improvements 1,875,183 1,933,645
Less: accumulated depreciation and amortization (443,380) (424,453)
Real estate, net 2,741,390 2,796,181
Real estate available and held for sale 354,814 360,517
Total real estate 3,096,204 3,156,698
Net Lease
   
Real Estate Properties [Line Items]    
Land and land improvements 328,143 350,817
Buildings and improvements 1,283,303 1,346,071
Less: accumulated depreciation and amortization (352,418) (338,640)
Real estate, net 1,259,028 1,358,248
Real estate available and held for sale 0 0
Total real estate 1,259,028 1,358,248
Operating Properties
   
Real Estate Properties [Line Items]    
Land and land improvements 152,332 132,934
Buildings and improvements 591,880 587,574
Less: accumulated depreciation and amortization (86,747) (82,420)
Real estate, net 657,465 638,088
Real estate available and held for sale 232,771 228,328
Total real estate 890,236 866,416
Land
   
Real Estate Properties [Line Items]    
Land and land improvements 829,112 803,238
Buildings and improvements 0 0
Less: accumulated depreciation and amortization (4,215) (3,393)
Real estate, net 824,897 799,845
Real estate available and held for sale 122,043 132,189
Total real estate $ 946,940 $ 932,034