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Long term Debt (Schedule of Long Term Debt) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Nov. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  | $ 2,800,000 |  |  |  | $ 2,800,000 |
Unamortized discount on notes payable |  | (27,433) |  |  |  | (23,835) |
Total notes payable, net of unamortized discount |  | 2,772,567 |  |  |  | 2,776,165 |
Capitalized lease obligation, due through June 2029 |  | 143,855 |  |  |  | 216,402 |
Total debt including current maturities |  | 2,916,422 |  |  |  | 2,992,567 |
Current maturities |  | (9,902) |  |  |  | (569,817) |
Total long-term debt |  | $ 2,906,520 |  |  |  | 2,422,750 |
Capital lease expiration date |  | Mar. 01, 2029 |  |  |  |  |
3.50% notes, due December 2017 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  |  |  |  |  | $ 550,000 |
Interest rate |  | 3.50% |  |  | 3.50% | 3.50% |
Notes payable, due date |  | December 2017 |  |  |  |  |
4.00% notes, due June 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  | $ 500,000 |  |  |  | $ 500,000 |
Interest rate |  | 4.00% |  |  |  | 4.00% |
Notes payable, due date |  | June 2022 |  |  |  |  |
4.45% notes, due December 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable | [1] | $ 600,000 |  |  |  | $ 600,000 |
Interest rate |  | 4.45% | [1] | 4.70% |  | 4.45% | [1]
Notes payable, due date | [1] | December 2022 |  |  |  |  |
6.875% notes, due August 15, 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  | $ 550,000 |  |  |  | $ 550,000 |
Interest rate |  | 6.875% |  |  |  | 6.875% |
Notes payable, due date |  | August 2024 |  |  |  |  |
5.75% notes, due August 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  | $ 550,000 |  |  |  |  |
Interest rate |  | 5.75% |  |  |  |  |
Notes payable, due date |  | August 2025 |  |  |  |  |
7.05% notes, due May 2029 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  | $ 250,000 |  |  |  | $ 250,000 |
Interest rate |  | 7.05% |  |  |  | 7.05% |
Notes payable, due date |  | May 2029 |  |  |  |  |
5.875% notes, due December 2042 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable | [1] | $ 350,000 |  |  |  | $ 350,000 |
Interest rate |  | 5.875% | [1] | 6.125% |  | 5.875% | [1]
Notes payable, due date | [1] | December 2042 |  |  |  |  |
[1] | Due to a series of ratings changes by credit agencies, the paying interest rates on the notes due December 2022 and December 2042 decreased from 4.7% to 4.45% and 6.125% to 5.875%, respectively, at December 2017.

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