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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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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.

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