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Debt - Senior Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 05, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Feb. 04, 2020
Dec. 31, 2019
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,400,000   $ 1,400,000      
Line of Credit Facility, Capacity Available for Trade Purchases   50,000   50,000      
Line of Credit Facility, Accordion Feature   300,000   $ 300,000      
Document Period End Date       Jun. 30, 2020      
Gain (Loss) on Extinguishment of Debt $ 25,900 0 $ 0 $ (25,915) $ 0    
Debt Instrument, Unamortized Premium $ 22,500            
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net           $ 3,400  
Senior Notes Aggregate Redemption Amount           $ 522,500  
6% Senior notes              
Debt Instrument [Line Items]              
Principal   $ 500,000   $ 500,000     $ 500,000
Stated interest rate, senior notes   6.00%   6.00%     6.00%
Five Percent Senior Notes Due Two Thousand Twenty Eight [Member]              
Debt Instrument [Line Items]              
Stated interest rate, senior notes           5.00%