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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 3,036,705 | $ 3,121,558
Unamortized discount | 1,502 | 1,556
Unamortized Debt Issuance Expense | 41,999 | 44,122
Long-term Debt, Current Maturities | 23,981 | 23,981
Long-term debt, gross, excluding current maturities | 3,012,724 | 3,097,577
Long-term debt, net of current maturities and debt issuance costs | 2,969,223 | 3,051,899
Parent |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 3,036,705 | 3,121,558
Unamortized discount | 1,502 | 1,556
Unamortized Debt Issuance Expense | 41,999 | 44,122
Long-term debt, net | 2,993,204 | 3,075,880
Long-term Debt, Current Maturities | 23,895 | 23,895
Long-term debt, net of current maturities and debt issuance costs | $ 2,968,854 | $ 3,051,481
Parent | Line of Credit | Bank Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate at period end | 4.162% | 3.882%
Unamortized discount | $ 1,502 | $ 1,556
Unamortized Debt Issuance Expense | 22,440 | 23,795
Parent | Senior Notes | 6.875 % Senior Notes Due 2023 |  |
Debt Instrument [Line Items] |  |
Unamortized discount | 0 | 0
Unamortized Debt Issuance Expense | $ 9,017 | $ 9,455
Debt Instrument, Interest Rate, Stated Percentage | 6.875% | 6.875%
Parent | Senior Notes | 6.375% Senior Notes Due 2026 |  |
Debt Instrument [Line Items] |  |
Unamortized discount | $ 0 | $ 0
Unamortized Debt Issuance Expense | $ 10,542 | $ 10,872
Debt Instrument, Interest Rate, Stated Percentage | 6.375% | 6.375%
Parent | Other Debt Obligations [Member] | Other |  |
Debt Instrument [Line Items] |  |
Unamortized discount | $ 0 | $ 0
Unamortized Debt Issuance Expense | $ 0 | $ 0
Debt Instrument, Interest Rate, Stated Percentage | 5.80% | 5.80%
Fair Value, Measurements, Nonrecurring [Member] | Parent | Line of Credit | Bank Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 1,536,251 | $ 1,621,054
Long-term debt, net | 1,512,309 | 1,595,703
Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | 6.875 % Senior Notes Due 2023 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 750,000 | 750,000
Long-term debt, net | 740,983 | 740,545
Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | 6.375% Senior Notes Due 2026 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 750,000 | 750,000
Long-term debt, net | 739,458 | 739,128
Fair Value, Measurements, Nonrecurring [Member] | Parent | Other Debt Obligations [Member] | Other |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 454 | 504
Long-term debt, net | $ 454 | $ 504

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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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