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Subsequent Events (Details) - USD ($)
$ in Thousands
Jan. 16, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 23, 2015
6.750% senior unsecured notes        
Subsequent Event [Line Items]        
Debt issued, aggregate principal amount   $ 750,000 $ 750,000  
Debt instrument, stated rate       6.75%
Subsequent Event | 7.75% senior unsecured notes        
Subsequent Event [Line Items]        
Debt issued, aggregate principal amount $ 750,000      
Debt instrument, stated rate 7.75%      
Proceeds from issuance of debt, net of discount $ 738,900      
Proceeds to repay unsecured debt principal, accrued interest and tender premium $ 554,800