Quarterly report pursuant to Section 13 or 15(d)

Debt, Net (Narrative) (Details)

v3.20.2
Debt, Net (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 19, 2020
Sep. 17, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt              
Loss on early extinguishment of debt     $ (3,237,000) $ 0 $ (3,237,000) $ 0  
Interest costs capitalized     2,900,000 $ 2,900,000 9,400,000 $ 7,300,000  
2.25% Notes | Unsecured senior notes              
Debt              
Debt instrument, face amount   $ 400,000,000.0 $ 400,000,000   $ 400,000,000    
Interest rate   2.25% 2.25%   2.25%    
Initial offering price   99.416%          
Proceeds from issuance of debt   $ 395,300,000          
Basis point used in determining redemption price prior to maturity   0.35%          
Redemption price   100.00%          
Unamortized discount included in carrying value     $ 4,700,000   $ 4,700,000    
Effective interest rate on debt     2.48%   2.48%    
3.70% Notes | Unsecured senior notes              
Debt              
Debt instrument, face amount     $ 300,000,000   $ 300,000,000    
Interest rate     3.70%   3.70%    
Unamortized discount included in carrying value     $ 128,000   $ 128,000   $ 534,000
Effective interest rate on debt     3.85%   3.85%    
Repurchased face amount   $ 122,900,000          
Repurchase amount of debt, rate   40.98%          
Repurchase face amount including accrued interest   $ 126,000,000.0          
Loss on early extinguishment of debt     $ (3,200,000)   $ (3,200,000)    
3.70% Notes | Unsecured senior notes | Subsequent Event              
Debt              
Repurchased face amount $ 177,100,000            
Repurchase face amount including accrued interest 180,900,000            
Loss on early extinguishment of debt $ 4,000,000