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Long-Term Debt 6.000% Senior Notes due 2026 (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Mar. 28, 2016
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 3,563,931 | $ 3,121,558 |
Unamortized Debt Issuance Expense | 50,909 | 44,122 |
Parent |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 3,563,931 | 3,121,558 |
Subsidiaries, Ownership Percentage |  |  | 100.00%
Unamortized Debt Issuance Expense | $ 50,909 | $ 44,122 |
Parent | Senior Notes [Member] | 6.000% Senior Notes Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 101.00% |  |
Subsidiaries, Ownership Percentage | 100.00% |  |
Unamortized Debt Issuance Expense | $ 11,027 |  |
Parent | Senior Notes [Member] | 6.000% Senior Notes Due 2026 [Member] | Base Rate [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) | 0.25% |  |
Parent | Senior Notes [Member] | 6.000% Senior Notes Due 2026 [Member] | Base Rate [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) | 1.00% |  |
Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes [Member] | 6.000% Senior Notes Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 700,000 |  |
After August 15, 2021 and Prior to 2024 [Domain] | Parent | Senior Notes [Member] | 6.000% Senior Notes Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Redemption Price, Percentage | 103.00% |  |
Prior to August 15, 2024 [Domain] | Parent | Senior Notes [Member] | 6.000% Senior Notes Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |  |

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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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