Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Long-Term Debt (Details) - USD ($)		3 Months Ended		9 Months Ended
Long-Term Debt (Details) - USD ($)	Jun. 17, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Long-Term Debt [Line Items]
Long-term Line of Credit and Senior Notes, Noncurrent		$ 2,353,038,000		$ 2,353,038,000		$ 2,732,798,000
Gain on extinguishment of debt		$ 25,070,000	$ 0	$ 264,546,000	$ 0
Senior Secured Notes, Senior Unsecured Notes, and 1.50% Senior Unsecured Convertible Notes due 2021 [Member]
Long-Term Debt [Line Items]
Gain on extinguishment of debt	$ 227,300,000