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Debt - Schedule of Credit Agreement Terms (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Feb. 28, 2019
Jan. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]              
Revolving credit facility borrowings $ 55,000,000   $ 55,000,000       $ 0
Debt satisfaction charges, net 0 $ 0 103,000 $ 0      
Unsecured Term Loan              
Debt Instrument [Line Items]              
Unamortized debt issuance costs 1,046,000   1,046,000       $ 1,267,000
Unsecured Revolving Credit Facility, Expiring August 2019 | Unsecured Revolving Credit Facility              
Debt Instrument [Line Items]              
Face amount of debt instrument 600,000,000   600,000,000        
Maximum borrowing capacity         $ 600,000,000 $ 505,000,000  
Revolving credit facility borrowings 55,000,000   55,000,000        
Remaining borrowing capacity 545,000,000   545,000,000        
Debt satisfaction charges, net     93,000        
Unsecured Term Loan, Expiring January 2021 | Unsecured Term Loan              
Debt Instrument [Line Items]              
Face amount of debt instrument $ 300,000,000   $ 300,000,000     $ 300,000,000  
London Interbank Offered Rate (LIBOR) | Unsecured Revolving Credit Facility, Expiring August 2019 | Unsecured Revolving Credit Facility              
Debt Instrument [Line Items]              
Basis spread on variable rate     0.90%        
London Interbank Offered Rate (LIBOR) | Unsecured Term Loan, Expiring January 2021 | Unsecured Term Loan              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.00%