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Financing (Outstanding Financing Facilities) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 17, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Financing |  |  |  |
Senior notes |  |  | $ 3,130,122 | $ 2,632,390
Senior notes, unamortized discount |  |  | 4,300 | 3,700
Senior notes, unamortized debt issuance costs |  |  | 17,100 | 15,900
Long-term debt |  |  | 3,417,122 | 2,978,390
$500 million, 4.875% Senior Notes due 2021 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | 700 | 1,100
Senior notes, unamortized debt issuance costs |  |  | 900 | 1,400
$300 million, 4.625% Senior Notes due 2021 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | 100 | 200
Senior notes, unamortized debt issuance costs |  |  | 600 | 800
$300 million, 3.800% Senior Notes due 2022 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | 500 | 600
Senior notes, unamortized debt issuance costs |  |  | 1,000 | 1,200
$300 million, 3.850% Senior Notes due 2023 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | 100 | 100
Senior notes, unamortized debt issuance costs |  |  | 1,200 | 1,400
$500 million, 3.550% Senior Notes due 2026 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | 600 | 700
Senior notes, unamortized debt issuance costs |  |  | 3,100 | 3,500
$750 million, 3.600% Senior Notes due 2027 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | 1,100 | 1,200
Senior notes, unamortized debt issuance costs |  |  | 5,100 | 5,600
$500 million, 4.350% Senior Notes due 2028 [Member] |  |  |  |
Financing |  |  |  |
Senior notes, unamortized discount |  |  | 1,300 |
Senior notes, unamortized debt issuance costs |  |  | 3,700 |
Revolving Credit Facility [Member] |  |  |  |
Financing |  |  |  |
Unsecured revolving credit facility |  |  | $ 287,000 | 346,000
Unsecured revolving credit facility, weighted-average variable interest rate |  |  | 4.56% |
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 |  |  | 2028 |
Senior notes [Member] | $500 million, 4.875% Senior Notes due 2021 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [1] |  | $ 498,371 | 497,565
Senior notes, face amount |  |  | $ 500,000 | $ 500,000
Interest rate of senior notes |  |  | 4.875% | 4.875%
Senior notes maturity, year |  |  | 2021 | 2021
Senior notes, effective interest rate |  |  | 4.952% |
Senior notes [Member] | $300 million, 4.625% Senior Notes due 2021 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [2] |  | $ 299,244 | $ 298,961
Senior notes, face amount |  |  | $ 300,000 | $ 300,000
Interest rate of senior notes |  |  | 4.625% | 4.625%
Senior notes maturity, year |  |  | 2021 | 2021
Senior notes, effective interest rate |  |  | 4.645% |
Senior notes [Member] | $300 million, 3.800% Senior Notes due 2022 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [3] |  | $ 298,574 | $ 298,214
Senior notes, face amount |  |  | $ 300,000 | $ 300,000
Interest rate of senior notes |  |  | 3.80% | 3.80%
Senior notes maturity, year |  |  | 2022 | 2022
Senior notes, effective interest rate |  |  | 3.845% |
Senior notes [Member] | $300 million, 3.850% Senior Notes due 2023 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [4] |  | $ 298,821 | $ 298,583
Senior notes, face amount |  |  | $ 300,000 | $ 300,000
Interest rate of senior notes |  |  | 3.85% | 3.85%
Senior notes maturity, year |  |  | 2023 | 2023
Senior notes, effective interest rate |  |  | 3.851% |
Senior notes [Member] | $500 million, 3.550% Senior Notes due 2026 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [5] |  | $ 496,240 | $ 495,792
Senior notes, face amount |  |  | $ 500,000 | $ 500,000
Interest rate of senior notes |  |  | 3.55% | 3.55%
Senior notes maturity, year |  |  | 2026 | 2026
Senior notes, effective interest rate |  |  | 3.57% |
Senior notes [Member] | $750 million, 3.600% Senior Notes due 2027 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [6] |  | $ 743,868 | $ 743,275
Senior notes, face amount |  |  | $ 750,000 | $ 750,000
Interest rate of senior notes |  |  | 3.60% | 3.60%
Senior notes maturity, year |  |  | 2027 | 2027
Senior notes, effective interest rate |  |  | 3.619% |
Senior notes [Member] | $500 million, 4.350% Senior Notes due 2028 [Member] |  |  |  |
Financing |  |  |  |
Senior notes | [7] |  | $ 495,004 |
Senior notes, face amount |  | $ 500,000 | $ 500,000 |
Interest rate of senior notes |  | 4.35% | 4.35% |
Senior notes maturity, year |  | 2028 | 2028 |
Senior notes, effective interest rate |  |  | 4.383% |
[1] | Net of unamortized discount of $0.7 million and $1.1 million as of December 31, 2018 and 2017, respectively, and debt issuance costs of $0.9 million and $1.4 million as of December 31, 2018 and 2017, respectively.
[2] | Net of unamortized discount of $0.1 million and $0.2 million as of December 31, 2018 and 2017, respectively, and debt issuance costs of $0.6 million and $0.8 million as of December 31, 2018 and 2017, respectively.
[3] | Net of unamortized discount of $0.5 million and $0.6 million as of December 31, 2018 and 2017, respectively, and debt issuance costs of $1.0 million and $1.2 million as of December 31, 2018 and 2017, respectively.
[4] | Net of unamortized discount of less than $0.1 million as of December 31, 2018 and 2017, and debt issuance costs of $1.2 million and $1.4 million as of December 31, 2018 and 2017, respectively.
[5] | Net of unamortized discount of $0.6 million and $0.7 million as of December 31, 2018 and 2017, respectively, and debt issuance costs of $3.1 million and $3.5 million as of December 31, 2018 and 2017, respectively.
[6] | Net of unamortized discount of $1.1 million and $1.2 million as of December 31, 2018 and 2017, respectively, and debt issuance costs of $5.1 million and $5.6 million as of December 31, 2018 and 2017, respectively.
[7] | Net of unamortized discount of $1.3 million as of December 31, 2018, and debt issuance costs of $3.7 million as of December 31, 2018.

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