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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 3,190,947 | $ 3,283,129
Unamortized discount | 1,719 | 1,888
Unamortized Debt Issuance Expense | 49,390 | 51,786
Current maturities of long-term debt | 23,987 | 30,336
Long-term debt, gross, excluding current maturities | 3,166,960 | 3,252,793
Long-term debt, net of current maturities and debt issuance costs | 3,115,851 | 3,199,119
Parent |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 3,190,947 | 3,283,129
Unamortized discount | 1,719 | 1,888
Unamortized Debt Issuance Expense | 49,390 | 51,786
Long-term debt, net | 3,139,838 | 3,229,455
Current maturities of long-term debt | 23,895 | 30,250
Long-term debt, net of current maturities and debt issuance costs | $ 3,115,397 | $ 3,198,613
Parent | Line of Credit | Bank Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate at period end | 3.494% | 3.44%
Unamortized discount | $ 1,719 | $ 1,888
Unamortized Debt Issuance Expense | 27,528 | 28,503
Parent | Senior Notes | 6.875 % Senior Notes Due 2023 |  |
Debt Instrument [Line Items] |  |
Unamortized discount | 0 | 0
Unamortized Debt Issuance Expense | $ 11,530 | $ 11,209
Debt Instrument, Interest Rate, Stated Percentage | 6.875% | 6.88%
Parent | Senior Notes | 6.375% Senior Notes Due 2026 |  |
Debt Instrument [Line Items] |  |
Unamortized discount | $ 0 | $ 0
Unamortized Debt Issuance Expense | $ 10,332 | $ 12,074
Debt Instrument, Interest Rate, Stated Percentage | 6.375% | 6.38%
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 | $ 1,690,401 | $ 1,782,538
Long-term debt, net | 1,661,154 | 1,752,147
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 | 738,470 | 738,791
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 | 739,668 | 737,926
Fair Value, Measurements, Nonrecurring [Member] | Parent | Other Debt Obligations [Member] | Other |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 546 | 591
Long-term debt, net | $ 546 | $ 591

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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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