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Debt And Lines Of Credit , Table - Schedule of debt and lines of credit (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Secured debt $ 3,200,000     $ 3,180,592 $ 2,815,957
Debt weighted average to maturity, years   11 years 1 month 6 days     9 years
Weighted average interest rate   4.00%     4.50%
Lines of credit       183,898 $ 128,000
Collateralized term loans - CMBS [Member]          
Debt Instrument [Line Items]          
Secured debt   $ 697,589     $ 405,702
Debt weighted average to maturity, years   7 years     4 years 1 month 6 days
Weighted average interest rate   3.70%     5.10%
Aspen and Series B-3 Preferred OP Units [Member]          
Debt Instrument [Line Items]          
Secured debt       34,663  
Preferred OP units - mandatorily redeemable       34,663 $ 37,338
Debt weighted average to maturity, years   0 years     4 years 8 months 12 days
Weighted average interest rate   0.00%     6.60%
Preferred Equity, Mandatorily Redeemable [Member]          
Debt Instrument [Line Items]          
Preferred OP units - mandatorily redeemable       35,249 $ 35,277
Debt Instrument, Term   2 years 9 months 18 days      
Debt weighted average to maturity, years         3 years 9 months 18 days
Weighted average interest rate   6.00%     6.00%
Secured Debt [Member]          
Debt Instrument [Line Items]          
Secured debt       $ 3,434,402 $ 3,124,303
Debt Instrument, Term 25 years 10 years 20 years 21 years 20 years
Reported Value Measurement [Member] | Secured Debt [Member]          
Debt Instrument [Line Items]          
Secured debt $ 0 $ 0     $ 107,731
Debt weighted average to maturity, years   4 years     14 years 4 months 24 days
Weighted average interest rate   6.50%     9.90%
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]          
Debt Instrument [Line Items]          
Secured debt   $ 374,727     $ 770,417
Debt weighted average to maturity, years   4 years 10 months 24 days     5 years 1 month 6 days
Weighted average interest rate   3.90%     4.40%
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]          
Debt Instrument [Line Items]          
Secured debt   $ 397,868     $ 380,680
Debt weighted average to maturity, years   3 years 1 month 6 days     5 years 10 months 24 days
Weighted average interest rate   5.10%     3.90%
Life Companies [Member] | Collateralized Mortgage Backed Securities [Member]          
Debt Instrument [Line Items]          
Secured debt   $ 1,710,408     $ 1,259,158
Debt weighted average to maturity, years   17 years 1 month 6 days     14 years 4 months 24 days
Weighted average interest rate   4.00%     3.90%
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Lines of credit       $ 183,898  
Revolving Credit Facility [Member] | Line of Credit [Member]          
Debt Instrument [Line Items]          
Debt weighted average to maturity, years   3 years 6 months     2 years 3 months 18 days
Weighted average interest rate   2.70%     3.80%
Revolving Credit Facility [Member] | Secured Debt [Member]          
Debt Instrument [Line Items]          
Lines of credit       $ 180,600