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Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 3,997,928 | $ 4,030,035
Unamortized discount | (1,218) | (1,286)
Unamortized Debt Issuance Expense | (47,205) | (49,449)
Long-term Debt, Current Maturities | 26,986 | 24,181
Long-term debt, gross, excluding current maturities | 3,970,942 | 4,005,854
Long-term debt, net of current maturities and debt issuance costs | 3,922,519 | 3,955,119
Parent |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 3,997,928 | 4,030,035
Unamortized discount | (1,218) | (1,286)
Unamortized Debt Issuance Expense | (47,205) | (49,449)
Long-term debt, net | 3,949,505 | 3,979,300
Long-term Debt, Current Maturities | 26,695 | 23,895
Long-term debt, net of current maturities and debt issuance costs | $ 3,864,238 | $ 3,896,699
Parent | Line of Credit | Bank Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate at period end | 4.649% | 4.651%
Unamortized discount | $ (1,218) | $ (1,286)
Unamortized Debt Issuance Expense | (20,390) | (21,515)
Parent | Senior Notes | 6.875 % Senior Notes Due 2023 |  |
Debt Instrument [Line Items] |  |
Unamortized discount | 0 | 0
Unamortized Debt Issuance Expense | $ (7,262) | $ (7,701)
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 | $ (9,263) | $ (9,594)
Debt Instrument, Interest Rate, Stated Percentage | 6.375% | 6.375%
Parent | Senior Notes | 6.000% Senior Notes Due 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized discount | $ 0 | $ 0
Unamortized Debt Issuance Expense | $ (10,290) | $ (10,639)
Debt Instrument, Interest Rate, Stated Percentage | 6.00% | 6.00%
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 | 11.023% | 11.01%
Fair Value, Measurements, Nonrecurring [Member] | Parent | Line of Credit | Bank Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 1,739,356 | $ 1,771,330
Long-term debt, net | 1,717,748 | 1,748,529
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 | 742,738 | 742,299
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 | 740,737 | 740,406
Fair Value, Measurements, Nonrecurring [Member] | Parent | Senior Notes | 6.000% Senior Notes Due 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 700,000 | 700,000
Long-term debt, net | 689,710 | 689,361
Fair Value, Measurements, Nonrecurring [Member] | Parent | Other Debt Obligations [Member] | Other |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | 58,572 | 58,705
Long-term debt, net | $ 58,572 | $ 58,705

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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