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Real Estate (Schedule of Real Estate Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Real Estate Properties [Line Items]    
Land and land improvements $ 1,270,594 $ 1,286,989
Buildings and improvements 1,876,525 1,933,645
Less: accumulated depreciation and amortization (433,149) (424,453)
Real estate, net 2,713,970 2,796,181
Real estate available and held for sale 334,691 360,517
Total real estate 3,048,661 3,156,698
Net Lease
   
Real Estate Properties [Line Items]    
Land and land improvements 328,143 350,817
Buildings and improvements 1,283,103 1,346,071
Less: accumulated depreciation and amortization (343,294) (338,640)
Real estate, net 1,267,952 1,358,248
Real estate available and held for sale 0 0
Total real estate 1,267,952 1,358,248
Operating Properties
   
Real Estate Properties [Line Items]    
Land and land improvements 132,934 132,934
Buildings and improvements 593,422 587,574
Less: accumulated depreciation and amortization (86,173) (82,420)
Real estate, net 640,183 638,088
Real estate available and held for sale 204,653 228,328
Total real estate 844,836 866,416
Land
   
Real Estate Properties [Line Items]    
Land and land improvements 809,517 803,238
Buildings and improvements 0 0
Less: accumulated depreciation and amortization (3,682) (3,393)
Real estate, net 805,835 799,845
Real estate available and held for sale 130,038 132,189
Total real estate $ 935,873 $ 932,034