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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 |

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