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Summary of Significant Accounting Policies - Gain (Loss) on Disposal (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020 USD ($) facility	Sep. 30, 2019 USD ($) facility	Jun. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Gain (loss) on disposition of property plant equipment	$ 75,800	$ 9,300		$ 78,200	$ 17,100
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Property, Plant and Equipment [Line Items]
Gain (loss) on disposition of property plant equipment	$ 76,400
Sale and lease back transaction gain loss net | facility	2
Impairment of long-lived assets to be disposed			$ 24,800
United States | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Property, Plant and Equipment [Line Items]
Gain (loss) on disposition of property plant equipment		$ 9,800
United Kingdom | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Property, Plant and Equipment [Line Items]
Gain (loss) on disposition of property plant equipment			$ 36,000
Sale and lease back transaction gain loss net | facility		5

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Number Of Facilities In Sale-Leaseback Transaction

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: 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

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Reference 1: 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

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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 15
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