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Debt And Lines Of Credit , Narrative - Collateralized Term Loans (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
site
properties
Rate
Mar. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
site
Rate
Debt Instrument [Line Items]        
Gain (loss) on extinguishment of debt $ 3,279 $ 653    
Reduction in secured borrowing balance $ 0 5,055    
Weighted average interest rate | Rate 3.60%     4.00%
Sites | site 529     10,390
Debt weighted average to maturity, length 10 years 7 months 6 days     11 years 1 month 6 days
Total debt $ 3,273,808     $ 3,180,592
Document Period End Date Mar. 31, 2020      
Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 230,000 $ 265,000 $ 250,000 $ 400,000
Debt instrument term 15 years 25 years 10 years 21 years
Debt Instrument, Interest Rate, Stated Percentage 2.995% 4.17% 2.925% 4.026%
Commercial Mortgage Backed Securities [Member]        
Debt Instrument [Line Items]        
Weighted average interest rate | Rate 3.40%     5.10%
Debt weighted average to maturity, length 9 years     3 years 1 month 6 days
Total debt $ 902,375     $ 397,868
Collateralized Mortgage Backed Securities [Member]        
Debt Instrument [Line Items]        
Net book value of properties securing collateralized term loans $ 3,200,000      
Properties securing debt [Member] | Collateralized Mortgage Backed Securities [Member]        
Debt Instrument [Line Items]        
Sites | site 73,364      
Debt Instrument, number of properties securing a debt instument | properties 185