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Mortgage Notes Payable, Credit Facilities and Senior Notes (Carrying Value of Debt) (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Dec. 20, 2019
Nov. 10, 2017
Jul. 26, 2016
Dec. 03, 2014
Dec. 09, 2013
Debt Instrument [Line Items]              
Credit facility $ 230,633,000 $ 80,743,000          
Senior Notes 943,564,000 942,850,000          
Term Loan Agreement              
Debt Instrument [Line Items]              
Principal amount 300,000,000 300,000,000 $ 300,000,000.0        
Net unamortized deferred financing costs (1,505,000) (1,670,000)          
Term loan 298,495,000 298,330,000          
Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility 233,500,000 84,000,000          
Net unamortized deferred financing costs (2,867,000) (3,257,000)          
Credit facility 230,633,000 80,743,000          
Senior Notes | Senior Notes Due 2027              
Debt Instrument [Line Items]              
Principal amount 250,000,000 250,000,000   $ 250,000,000.0      
Net unamortized deferred financing costs (935,000) (998,000)          
Senior Notes 249,065,000 249,002,000          
Senior Notes | Senior Notes Due 2026              
Debt Instrument [Line Items]              
Principal amount 200,000,000 200,000,000     $ 200,000,000.0    
Net unamortized deferred financing costs (177,000) (191,000)          
Senior Notes 199,823,000 199,809,000          
Senior Notes | Senior Notes Due 2024              
Debt Instrument [Line Items]              
Principal amount 250,000,000 250,000,000       $ 250,000,000.0  
Unamortized debt discount (1,737,000) (1,912,000)          
Net unamortized deferred financing costs (983,000) (1,094,000)          
Senior Notes 247,280,000 246,994,000          
Senior Notes | Senior Notes Due 2023              
Debt Instrument [Line Items]              
Principal amount 250,000,000 250,000,000         $ 250,000,000.0
Unamortized debt discount (1,695,000) (1,915,000)          
Net unamortized deferred financing costs (909,000) (1,040,000)          
Senior Notes $ 247,396,000 $ 247,045,000