Quarterly report pursuant to Section 13 or 15(d)

Debt, Net (Narrative) (Details)

v3.21.1
Debt, Net (Narrative) (Details) - USD ($)
 3 Months Ended
Apr. 12, 2021
Mar. 11, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Debt          
Loss on early extinguishment of debt     $ (33,166,000) $ 0  
Interest costs capitalized     1,800,000 $ 3,400,000  
2.75% Notes | Unsecured senior notes          
Debt          
Debt instrument, face amount   $ 600,000,000.0 $ 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     $ 10,100,000    
Effective interest rate on debt     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 | Unsecured senior notes          
Debt          
Debt instrument, face amount     $ 350,000,000    
Unamortized discount included in carrying value     $ 331,000   $ 781,000
Effective interest rate on debt     3.70%    
Repurchased face amount   $ 184,400,000      
Repurchase face amount including accrued interest   196,700,000      
3.60% Senior Notes | Unsecured senior notes | Subsequent Event          
Debt          
Repurchased face amount $ 165,600,000        
Repurchase face amount including accrued interest 176,300,000        
5.250% Senior Notes | Unsecured senior notes          
Debt          
Debt instrument, face amount     $ 250,000,000    
Unamortized discount included in carrying value     $ 630,000   $ 1,600,000
Effective interest rate on debt     5.49%    
Repurchased face amount   145,600,000      
Repurchase face amount including accrued interest   $ 164,700,000      
5.250% Senior Notes | Unsecured senior notes | Subsequent Event          
Debt          
Repurchased face amount 104,400,000        
Repurchase face amount including accrued interest 117,700,000        
3.60% Senior Notes and 5.25% Senior Notes | Unsecured senior notes          
Debt          
Loss on early extinguishment of debt     $ 33,200,000    
3.60% Senior Notes and 5.25% Senior Notes | Unsecured senior notes | Subsequent Event          
Debt          
Loss on early extinguishment of debt $ 25,000,000