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Condensed Consolidating Financial Information (Narrative) (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 28, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 3,036,705,000 | $ 3,121,558,000 |
Parent |  |  |
Debt Instrument [Line Items] |  |  |
Subsidiaries, Ownership Percentage |  |  | 100.00%
Long-term Debt, Gross | $ 3,036,705,000 | $ 3,121,558,000 |
Parent | Senior Notes | 6.875 % Senior Notes Due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.875% | 6.875% |
Parent | Senior Notes | 6.375% Senior Notes Due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.375% | 6.375% |
Parent | Senior Notes | 6.000% Senior Notes Due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% | 6.00% |
Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | 6.875 % Senior Notes Due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 750,000,000 | $ 750,000,000 |
Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | 6.375% Senior Notes Due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 750,000,000 | 750,000,000 |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 | Parent | Senior Notes | 6.875 % Senior Notes Due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | 750,000,000 |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 | Parent | Senior Notes | 6.375% Senior Notes Due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | 750,000,000 |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 | Parent | Senior Notes | 6.000% Senior Notes Due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 700.0 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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