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Long-Term Debt Senior Notes (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 22, 2015 | Jun. 05, 2015 | May. 21, 2015 | May. 20, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from Senior Notes |  |  |  |  | $ 490,951,000 | $ 0 |  |  |  |  |
Senior Notes | $ 2,350,000,000 |  |  |  | 2,350,000,000 |  |  |  |  |  | $ 2,200,000,000
Loss on extinguishment of debt | 0 |  | $ 0 |  | 16,578,000 | 0 |  |  |  |  |
Gains (Losses) on Extinguishment of Debt, Non-Cash Portion |  |  |  |  | (4,123,000) | $ 0 |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
6.625% Senior Notes, Due 2019 Face Value | 0 |  |  |  | 0 |  |  |  |  |  | 350,000,000
6.50% Senior Notes, Due 2021 Face Value | 350,000,000 |  |  |  | 350,000,000 |  |  |  |  |  | 350,000,000
6.125% Senior Notes, Due 2022 Face Value | 600,000,000 |  |  |  | 600,000,000 |  |  |  |  |  | 600,000,000
6.50% Senior Notes, Due 2023 Face Value | 400,000,000 |  |  |  | 400,000,000 |  |  |  |  |  | 400,000,000
5% Senior Notes, Due 2024 Face Value | 500,000,000 |  |  |  | 500,000,000 |  |  |  |  |  | 500,000,000
5.625% Senior Notes, Due 2025 Face Value | 500,000,000 |  |  |  | 500,000,000 |  |  |  |  |  | 0
Senior Notes | $ 2,350,000,000 |  |  |  | 2,350,000,000 |  |  |  |  |  | $ 2,200,000,000
Debt Instrument, Covenant Compliance, Dividends Excluded From Computation |  |  |  |  | $ 6,500,000 |  |  |  |  |  |
Senior Notes [Member] | 5.625% Senior Notes Due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.625% |  |  |  | 5.625% |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 500,000,000 |  |
Debt Issuance Cost |  |  |  |  | $ 9,000,000 |  |  |  |  |  |
Senior Notes [Member] | 5.625% Senior Notes Due 2025 [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 105.625% |  |  |  |  |  |
Debt Instrument, Maximum Early Redemption, Percentage of Principal |  |  |  |  | 35.00% |  |  |  |  |  |
Senior Notes [Member] | 5.625% Senior Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Two [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 100.00% |  |  |  |  |  |
Senior Notes [Member] | 5.625% Senior Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Three [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 102.813% |  |  |  |  |  |
Senior Notes [Member] | 5.625% Senior Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Four [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 101.875% |  |  |  |  |  |
Senior Notes [Member] | 5.625% Senior Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Five [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 100.938% |  |  |  |  |  |
Senior Notes [Member] | 5.625% Senior Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Six [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 100.00% |  |  |  |  |  |
Senior Notes [Member] | 6.625% Senior Notes Due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.625% |  |  |  | 6.625% |  |  |  |  |  |
Price per Note Tendered |  |  |  |  |  |  |  | $ 1,006.88 |  | $ 1,036.88 |
Debt Instrument, Face Amount, Individual Note |  |  |  |  |  |  |  | 1,000 |  | 1,000 |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | 1,500,000 |  | $ 242,900,000 |
Percentage of Notes Tendered |  |  |  |  |  |  |  |  |  | 69.00% |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  | $ 1,600,000 |  | $ 256,200,000 |
Loss on extinguishment of debt |  | $ 16,578,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Premium |  | 12,500,000 |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt, Non-Cash Portion |  | $ 4,123,000 |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 6.625% Senior Notes Due 2019 [Member] | Early Debt Redemption, Year [Domain] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  | $ 111,500,000 |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 103.313% |  |  |  |  |  |  |
Senior Notes [Member] | 6.50% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |  |  |  | 6.50% |  |  |  |  |  |
Senior Notes [Member] | 6.125% Senior Notes Due 2022 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.125% |  |  |  | 6.125% |  |  |  |  |  |
Senior Notes [Member] | 6.50% Senior Notes Due 2023 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |  |  |  | 6.50% |  |  |  |  |  |
Senior Notes [Member] | 5% Senior Notes Due 2024 [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |  |  |  | 5.00% |  |  |  |  |  |

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