Quarterly report pursuant to Section 13 or 15(d)

Long-term Debt - Additional Information (Details)

v3.20.1
Long-term Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 15, 2021
Feb. 20, 2020
Dec. 13, 2019
Sep. 12, 2019
Jun. 06, 2019
Feb. 21, 2019
Sep. 30, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jul. 31, 2019
Debt Instrument [Line Items]                      
Principal, net of issuance costs               $ 633,000,000   $ 700,000,000  
Total interest expense               $ 18,135,000 $ 15,430,000    
Dividends declared per share (in usd per share)   $ 0.340 $ 0.335 $ 0.335 $ 0.335 $ 0.335   $ 0.34      
Senior Unsecured Notes                      
Debt Instrument [Line Items]                      
Principal             $ 150,000,000        
Principal, net of issuance costs                     $ 344,000,000
Proceeds from issuance of debt             157,000,000        
Senior Unsecured Notes | 2024 Notes                      
Debt Instrument [Line Items]                      
Principal               $ 500,000,000   500,000,000 $ 350,000,000
Principal, net of issuance costs             $ 155,000,000        
Interest rate                     5.25%
Debt instrument, yield to maturity               4.13%      
Maximum unencumbered assets percentage of unsecured debt               120.00%      
Total interest expense               $ 7,000,000      
Senior Unsecured Notes | 2024 Notes | Forecast                      
Debt Instrument [Line Items]                      
Redemption price, percentage 40.00%                    
Offer share percentage 105.25%                    
Convertible Senior Notes | Senior Unsecured Notes Due 2025                      
Debt Instrument [Line Items]                      
Principal               $ 400,000,000      
Interest rate               6.00%      
Convertible Senior Notes | 4.125% Convertible Senior Notes Due September 1, 2022                      
Debt Instrument [Line Items]                      
Principal               $ 150,000,000   $ 150,000,000  
Principal, net of issuance costs               $ 145,000,000      
Interest rate               4.125%      
Redemption price, percentage               100.00%      
Total interest expense               $ 2,000,000 $ 2,000,000    
Conversion rate of shares for each $1,000 principal amount of convertible notes               36.7550      
Conversion price per share (in usd per share)               $ 27.21      
Adjustment for dividends declared (in usd per share)               $ 0.33