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Debt - Senior Unsecured Notes Payable (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
May 10, 2017
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]          
Gross proceeds from issuance of senior notes     $ 0 $ 200,000  
Senior unsecured notes payable          
Debt Instrument [Line Items]          
Debt instrument face amount   $ 300,000 $ 300,000   $ 300,000
Senior unsecured notes payable | 5.25% Senior Notes due 2025          
Debt Instrument [Line Items]          
Debt instrument face amount $ 300,000        
Interest rate (percent) 5.25%        
Gross proceeds from issuance of senior notes $ 300,000        
Net proceeds from issuance of senior notes $ 294,000        
Redemption price, percentage upon change of control (percent)   101.00%