Quarterly report pursuant to Section 13 or 15(d)

Debt, Net (Narrative) (Details)

v3.21.2
Debt, Net (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 11, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Apr. 12, 2021
Dec. 31, 2020
Debt              
Loss on early extinguishment of debt   $ (25,228,000) $ 0 $ (58,394,000) $ 0    
Interest costs capitalized   1,700,000 $ 3,200,000 3,500,000 $ 6,500,000    
2.75% Notes | Unsecured senior notes              
Debt              
Debt instrument, face amount $ 600,000,000.0 600,000,000   $ 600,000,000      
Initial offering price 98.95%            
Proceeds from issuance of debt $ 589,800,000            
Redemption period before maturity date for 100% redemption price       3 months      
Redemption price on or after three months prior to maturity date 100.00%            
Unamortized discount included in carrying value   $ 9,900,000   $ 9,900,000      
Effective interest rate on debt   2.94%   2.94%      
2.75% Notes | Unsecured senior notes | Adjusted Treasury              
Debt              
Basis point used in determining redemption price prior to maturity 0.25%            
3.60% Senior Notes and 5.25% Senior Notes | Unsecured senior notes              
Debt              
Loss on early extinguishment of debt   $ 25,200,000   $ 58,400,000      
3.60% Senior Notes | Unsecured senior notes              
Debt              
Debt instrument, face amount   350,000,000   350,000,000      
Unamortized discount included in carrying value             $ 781,000
Effective interest rate on debt             3.70%
Repurchased face amount $ 184,400,000         $ 165,600,000  
Repurchase face amount including accrued interest 196,700,000         176,300,000  
5.250% Senior Notes | Unsecured senior notes              
Debt              
Debt instrument, face amount   $ 250,000,000   $ 250,000,000      
Unamortized discount included in carrying value             $ 1,600,000
Effective interest rate on debt             5.49%
Repurchased face amount 145,600,000         104,400,000  
Repurchase face amount including accrued interest $ 164,700,000         $ 117,700,000