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Debt (6.00% Senior Notes) (Details) - Senior Notes - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 25, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 18, 2016
6.00% Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  | 6.00% |  | 6.00%
Debt instrument, face amount |  |  |  | $ 350,000,000
Loan costs |  |  |  | $ 6,000,000
Percentage of principal amount redeemable |  | 101.00% |  |
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 |  | $ 50,000,000 |  |
Violation or event of default, interest payment failure, failure to comply with other indenture agreements, term |  | 60 days |  |
6.00% Senior Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notice period prior to redemption |  | 30 days |  |
6.00% Senior Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Notice period prior to redemption |  | 60 days |  |
6.00% Senior Notes | Redemption, Period On Or Prior To April 15, 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of principal amount redeemed |  | 35.00% |  |
Redemption price percentage |  | 106.00% |  |
6.00% Senior Notes | Redemption, Period Before April 15, 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage |  | 100.00% |  |
6.00% Senior Notes | Redemption, Period One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage |  | 103.00% |  |
6.00% Senior Notes | Redemption, Period Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage |  | 102.00% |  |
6.00% Senior Notes | Redemption, Period Three |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage |  | 101.00% |  |
6.00% Senior Notes | Redemption, Period Four |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage |  | 100.00% |  |
5.875% Senior Notes due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 5.875% | 5.875% | 5.875% |
Debt instrument, face amount | $ 250,000,000.0 |  |  |
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 |  |  |
5.875% Senior Notes due 2024 | Redemption, Period Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 100.00% |  |  |
5.875% Senior Notes due 2024 | Redemption, Period Four |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 102.938% |  |  |

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