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Debt (5.875% Senior Notes Due 2024) (Details) - USD ($) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 25, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 19, 2013 | Feb. 10, 2011
Debt Instrument [Line Items] |  |  |  |  |
Capitalized loan costs |  | $ 42,300,000 | $ 48,900,000 |  |
5.875% Senior Notes due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Capitalized loan costs | $ 4,600,000 |  |  |  |
Senior Notes | 5.125% Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 300,000,000.0 |
Stated interest rate |  | 5.125% | 5.125% | 5.125% |
Senior Notes | 5.125% Senior Notes | Redemption, Period 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price percentage |  | 101.708% |  |  |
Senior Notes | 5.125% Senior Notes | Redemption, Period 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price percentage |  | 100.854% |  |  |
Senior Notes | 5.125% Senior Notes | Redemption, Period 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price percentage |  | 100.00% |  |  |
Senior Notes | 5.875% Senior Notes due 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 250,000,000.0 |  |  |  |
Stated interest rate | 5.875% | 5.875% | 5.875% |  |
Violation or event of default, interest payment failure, term | 30 days |  |  |  |
Violation or event of default, interest payment failure, maximum excess proceeds on sale of asset | $ 25,000,000 |  |  |  |
Violation or event of default, interest payment failure, failure to comply with other indenture agreements, term | 60 days |  |  |  |
Senior Notes | 5.875% Senior Notes due 2024 | Redemption, Period 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |
Senior Notes | 5.875% Senior Notes due 2024 | Redemption, Period 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price percentage | 102.938% |  |  |  |
Senior Notes | 5.875% Senior Notes due 2024 | Redemption, Period 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price percentage | 101.958% |  |  |  |
Senior Notes | 5.875% Senior Notes due 2024 | Redemption, Period 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price percentage | 100.979% |  |  |  |
Senior Notes | 5.875% Senior Notes due 2024 | 2022 and thereafter |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |
Senior Notes | 6.625% Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 300,000,000
Stated interest rate |  | 6.625% | 6.625% | 6.00% | 6.625%

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