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Real Estate (Schedule of Real Estate Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Real Estate Properties [Line Items]    
Land, at cost $ 438,288 $ 442,560
Buildings and improvements, at cost 1,272,627 1,298,333
Less: accumulated depreciation (367,933) (353,619)
Real estate, net 1,342,982 1,387,274
Real estate available and held for sale 68,045 237,531
Total real estate 1,411,027 1,624,805
Deferred expenses and other assets, net 147,121 162,112
Deferred operating lease income receivable, net 88,944 88,189
Accrued interest and operating lease income receivable, net 10,501 11,254
Net Lease    
Real Estate Properties [Line Items]    
Land, at cost 227,231 231,506
Buildings and improvements, at cost 950,548 987,050
Less: accumulated depreciation (314,373) (307,444)
Real estate, net 863,406 911,112
Real estate available and held for sale 924 155,051
Total real estate 864,330 1,066,163
Operating Properties    
Real Estate Properties [Line Items]    
Land, at cost 211,057 211,054
Buildings and improvements, at cost 322,079 311,283
Less: accumulated depreciation (53,560) (46,175)
Real estate, net 479,576 476,162
Real estate available and held for sale 67,121 82,480
Total real estate 546,697 558,642
Ground Net Lease Business    
Real Estate Properties [Line Items]    
Real estate, net   104,500
Deferred expenses and other assets, net   37,500
Deferred operating lease income receivable, net   8,200
Accrued interest and operating lease income receivable, net   3,500
Residential Operating Properties    
Real Estate Properties [Line Items]    
Real estate available and held for sale $ 67,100 $ 82,500