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Debt (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jul. 28, 2017 USD ($) | Jul. 15, 2016 USD ($) | Mar. 30, 2016 USD ($) | Dec. 17, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  | $ 3,150,000 | $ 2,858,000 |  |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  |  |  | $ 10,400 |  |  |
Unamortized Debt Issuance Expense |  | 16,967 | 15,062 |  |  | 9,400 |  |  |
Amortization of Debt Issuance Costs | $ 1,000 |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt | 3,000 | (3,004) | (50,639) | $ 0 |  |  |  |  |
Debt Instrument, Unamortized Discount |  | 33,776 | 23,675 |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 500,000 |  |  |  |  |  |  |
Term-A Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Insturment, Covenant, Minimum Interest Coverage Ratio |  | 2.50 |  |  |  |  |  |  |
Term-A Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50% |  |  |  |  |  |  |
Term-A Facility [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |  |  |  |  |
Term-A Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.25% |  |  |  |  |  |  |
Debt instrument, covenant, cash flow ratio |  | 5.00 |  |  |  |  |  |  |
Term-A Facility [Member] | Minimum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.25% |  |  |  |  |  |  |
Term-A Facility [Member] | Minimum [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |  |  |  |  |  |
Term-A Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  | 0.50% |  |  |  |  |  |  |
Debt instrument, covenant, cash flow ratio |  | 6.00 |  |  |  |  |  |  |
Term-A Facility [Member] | Maximum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25% |  |  |  |  |  |  |
Term-A Facility [Member] | Maximum [Member] | Eurodollar [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25% |  |  |  |  |  |  |
Term-A Facility [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  | $ 750,000 | $ 1,258,000 |  |  | 750,000 |  |  |
Repayments of Debt | $ 400,000 |  |  |  |  |  |  |  |
4.75% Senior Notes Due 2025 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | 800,000 |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  |  |  |  | $ 14,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.75% |  |  |  |  |  |  |
4.75% Senior Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Two [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 104.75% |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 35.00% |  |  |  |  |  |  |
4.75% Senior Notes Due 2025 [Member] | Debt Instrument, Redemption, Period Three [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |  |  |  |  |  |
4.75% Senior Notes Due 2025 [Member] | Minimum [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 102.375% |  |  |  |  |  |  |
5.00% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 1,000,000 |
Debt Issuance Costs, Gross |  |  |  |  |  |  |  | 2,100 |
Debt Instrument, Unamortized Discount |  |  |  |  |  |  |  | 17,500 |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.00% |  |  |  |  |  |  |
5.00% Senior Notes [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 102.50% |  |  |  |  |  |  |
5.00% Senior Notes [Member] | Debt Instrument, Redemption, Period Two [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |  |  |  |  |  |
7.75% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.75% |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  | $ 45,600 |  |
Debt extinguishment including principal interest and fees |  |  |  |  |  |  |  | $ 703,000 |
4.75% Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 600,000
Debt Issuance Costs, Gross |  |  |  |  |  |  |  |  | 1,500
Debt Instrument, Unamortized Discount |  |  |  |  |  |  |  |  | $ 10,500
Debt Instrument, Interest Rate, Stated Percentage |  | 4.75% |  |  |  |  |  |  |
4.75% Senior Notes [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 102.375% |  |  |  |  |  |  |
4.75% Senior Notes [Member] | Debt Instrument, Redemption, Period Two [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |  |  |  |  |  |
Term-B Facility [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  | $ 587,600 |  |  |  |

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