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Segment Reporting - Narratives (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
Sep. 30, 2016
USD ($)
Apr. 30, 2016
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | segment     2    
Straight line rent adjustment $ 3,400   $ 10,600 $ 12,300  
Impairment on equity method investment 6,571   13,600 29,183  
Loss on extinguishment of debt 13 $ 15,990 1,980 23,580  
Gain on change in control of interests 0   0 49,922  
Carrying value of previously held equity investment         $ 15,100
Fair value of previously held equity investment         $ 64,900
(Loss) gain on sale of real estate, net of tax (39) 82,287 2,871 132,702  
Operating Segments | Net Lease          
Segment Reporting Information [Line Items]          
Bad debt expense     4,800    
Operating Segments | Self storage          
Segment Reporting Information [Line Items]          
Loss on extinguishment of debt   16,000   23,600  
Real estate | Level 3 | Nonrecurring          
Segment Reporting Information [Line Items]          
Impairment on equity method investment 0 29,183 4,519 29,183  
Equity Method Investments | Level 3 | Nonrecurring          
Segment Reporting Information [Line Items]          
Impairment on equity method investment 6,295 $ 0 8,805 $ 0  
KBR | Written off          
Segment Reporting Information [Line Items]          
Impairment of intangible liabilities written off $ 15,700   15,700    
KBR | Assets held for sale          
Segment Reporting Information [Line Items]          
Accelerated amortization of intangible liabilities     $ 3,300