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Subsequent Events - Notes (Details) - USD ($)
12 Months Ended
Feb. 11, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]        
Write-off of deferred loan origination costs   $ 0 $ 0 $ 735,000
Premium on senior unsecured notes   $ 2,280,000 $ 2,796,000  
4.125 Percent Senior Unsecured Notes Due 2028 | Senior Notes | Subsequent Event        
Subsequent Event [Line Items]        
Gross proceeds from note issuance $ 400,000,000.0      
Debt instrument, redemption premium 425,500,000      
Extinguishment of debt, prepayment expense 18,800,000      
Debt instrument, increase, accrued interest 6,700,000      
Write-off of deferred loan origination costs (4,800,000)      
Premium on senior unsecured notes $ 2,200,000      
Stated interest rate 4.125%      
Proceeds from debt issuance, net $ 395,200,000      
Debt Instrument, Redemption, Period One | 4.125 Percent Senior Unsecured Notes Due 2028 | Senior Notes | Subsequent Event        
Subsequent Event [Line Items]        
Redemption price, expressed as percentage of principal amount 104.688%