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Financing (Outstanding Financing Facilities) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 17, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Financing |  |  |  |
Senior notes |  |  | $ 2,632,390 | $ 1,887,019
Senior notes, unamortized discount |  |  | 3,700 | 3,100
Senior notes, unamortized debt issuance costs |  |  | 15,900 | 10,600
Long-term debt |  |  | 2,978,390 | 1,887,019
$500 million, 4.875% Senior Notes due 2021 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | 1,100 | 1,400
Senior notes, unamortized debt issuance costs |  |  | $ 1,400 | $ 1,800
Interest rate of senior notes |  |  | 4.875% | 4.875%
Senior notes maturity, year |  |  | 2021 | 2021
Senior notes, effective interest rate |  |  | 4.956% |
$300 million, 4.625% Senior Notes due 2021 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | $ 200 | $ 200
Senior notes, unamortized debt issuance costs |  |  | $ 800 | $ 1,100
Interest rate of senior notes |  |  | 4.625% | 4.625%
Senior notes maturity, year |  |  | 2021 | 2021
Senior notes, effective interest rate |  |  | 4.645% |
$300 million, 3.800% Senior Notes due 2022 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | $ 600 | $ 700
Senior notes, unamortized debt issuance costs |  |  | $ 1,200 | $ 1,500
Interest rate of senior notes |  |  | 3.80% | 3.80%
Senior notes maturity, year |  |  | 2022 | 2022
Senior notes, effective interest rate |  |  | 3.845% |
$300 million, 3.850% Senior Notes due 2023 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | $ 100 | $ 100
Senior notes, unamortized debt issuance costs |  |  | $ 1,400 | $ 1,600
Interest rate of senior notes |  |  | 3.85% | 3.85%
Senior notes maturity, year |  |  | 2023 | 2023
Senior notes, effective interest rate |  |  | 3.851% |
$500 million, 3.550% Senior Notes due 2026 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | $ 700 | $ 800
Senior notes, unamortized debt issuance costs |  |  | $ 3,500 | $ 3,900
Interest rate of senior notes |  |  | 3.55% | 3.55%
Senior notes maturity, year |  |  | 2026 | 2026
Senior notes, effective interest rate |  |  | 3.57% |
$750 million, 3.600% Senior Notes due 2027 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | $ 1,200 |
Senior notes, unamortized debt issuance costs |  |  | $ 5,600 |
Interest rate of senior notes |  |  | 3.60% |
Senior notes maturity, year |  |  | 2027 |
Senior notes, effective interest rate |  |  | 3.619% |
Revolving Credit Facility [Member] |  |  |  |
Financing |  |  |  |
Unsecured revolving credit facility |  |  | $ 346,000 | $ 0
Unsecured revolving credit facility, weighted-average variable interest rate |  |  | 2.675% |
Senior notes [Member] | Minimum [Member] |  |  |  |
Financing |  |  |  |
Interest rate of senior notes |  |  | 3.55% |
Senior notes maturity, year |  |  | 2021 |
Senior notes [Member] | Maximum [Member] |  |  |  |
Financing |  |  |  |
Interest rate of senior notes |  |  | 4.875% |
Senior notes maturity, year |  |  | 2027 |
Senior notes [Member] | $500 million, 4.875% Senior Notes due 2021 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [1] |  | $ 497,565 | 496,758
Senior notes, face amount |  |  | 500,000 | 500,000
Senior notes [Member] | $300 million, 4.625% Senior Notes due 2021 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [2] |  | 298,961 | 298,679
Senior notes, face amount |  |  | 300,000 | 300,000
Senior notes [Member] | $300 million, 3.800% Senior Notes due 2022 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [3] |  | 298,214 | 297,868
Senior notes, face amount |  |  | 300,000 | 300,000
Senior notes [Member] | $300 million, 3.850% Senior Notes due 2023 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [4] |  | 298,583 | 298,355
Senior notes, face amount |  |  | 300,000 | 300,000
Senior notes [Member] | $500 million, 3.550% Senior Notes due 2026 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [5] |  | 495,792 | 495,359
Senior notes, face amount |  |  | 500,000 | $ 500,000
Senior notes [Member] | $750 million, 3.600% Senior Notes due 2027 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [6] |  | 743,275 |
Senior notes, face amount |  | $ 750,000 | $ 750,000 |
Interest rate of senior notes |  | 3.60% |  |
Senior notes maturity, year |  | 2027 |  |
[1] | Net of unamortized discount of $1.1 million and $1.4 million as of December 31, 2017 and 2016, respectively, and debt issuance costs of $1.4 million and $1.8 million as of December 31, 2017 and 2016, respectively.
[2] | Net of unamortized discount of $0.2 million and $0.2 million as of December 31, 2017 and 2016, respectively, and debt issuance costs of $0.8 million and $1.1 million as of December 31, 2017 and 2016, respectively.
[3] | Net of unamortized discount of $0.6 million and $0.7 million as of December 31, 2017 and 2016, respectively, and debt issuance costs of $1.2 million and $1.5 million as of December 31, 2017 and 2016, respectively.
[4] | Net of unamortized discount of less than $0.1 million as of December 31, 2017 and 2016, and debt issuance costs of $1.4 million and $1.6 million as of December 31, 2017 and 2016, respectively.
[5] | Net of unamortized discount of $0.7 million and $0.8 million as of December 31, 2017 and 2016, respectively, and debt issuance costs of $3.5 million and $3.9 million as of December 31, 2017 and 2016, respectively.
[6] | Net of unamortized discount of $1.2 million as of December 31, 2017, and debt issuance costs of $5.6 million as of December 31, 2017.

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