Long-Term Debt (Schedule of Maturities of Long-Term Debt) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Maturities of Long-term Debt [Abstract]
2020	$ 452,412
2021	674,000
2022	660,000
2023	24,100
2024	0
Thereafter	4,773,860
Total long-term debt	6,584,372
Subsidiaries [Member]
Maturities of Long-term Debt [Abstract]
2020	2,412
2021	0
2022	0
2023	0
2024	0
Thereafter	4,373,860
Total long-term debt	4,376,272
Parent Company [Member]
Maturities of Long-term Debt [Abstract]
2020	450,000
2021	674,000
2022	660,000
2023	24,100
2024	0
Thereafter	400,000
Total long-term debt	$ 2,208,100

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.

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
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-SubTopic 210
-Section S99
-Paragraph 1
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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
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