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Borrowing Arrangements - Second Amendment Unsecured Credit Facility And Term Loan (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
extension
Rate
Dec. 31, 2017
USD ($)
Rate
Dec. 31, 2018
USD ($)
Debt Instrument      
Line of credit facility, maximum borrowing capacity | $   $ 400,000,000.0  
Term loan, net | $ $ 198,949,000   $ 198,626,000
Number of extension periods (extension) | extension 2    
Extension period (months) 6 months    
Commitment fee | $   $ 3,700,000  
Unsecured line of credit | $ $ 160,000,000   $ 0
Line of credit remaining borrowing amount | $ 240,000,000.0    
Minimum      
Debt Instrument      
Derivative interest rate (in percentage) | Rate   0.15%  
Maximum      
Debt Instrument      
Derivative interest rate (in percentage) | Rate   0.35%  
Term Loans      
Debt Instrument      
Term loan, net | $ $ 200,000,000.0 $ 200,000,000.0  
Derivative, maturity years (in years) 3 years    
Term Loans | LIBOR | Minimum      
Debt Instrument      
Variable rate (in percentage) | Rate 1.20%    
Term Loans | LIBOR | Maximum      
Debt Instrument      
Variable rate (in percentage) | Rate 1.90%    
Line of Credit | LIBOR | Minimum      
Debt Instrument      
Variable rate (in percentage) | Rate   1.10%  
Line of Credit | LIBOR | Maximum      
Debt Instrument      
Variable rate (in percentage) | Rate   1.55%