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Income Taxes, Foreign Income Tax (Details) - country	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Foreign Tax Jurisdiction [Line Items]
U.S. federal income tax rate	21.00%	21.00%	21.00%
Number of countries in which the company has operations that constitute an income tax presence	92
Threshold for foreign taxing jurisdiction to be considered very low rate (in hundredths)	25.00%
HONG KONG [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	16.50%
SINGAPORE [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	17.00%
UNITED KINGDOM [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	19.00%
SAUDI ARABIA
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	20.00%

X

- Definition

The foreign entitys' statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The income tax rate threshold which is used to determine what constitutes a very low tax rate as attributable to foreign taxing entities.

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- Definition

The number of countries in which the entity has substantial enough operations to constitute and income tax presence.

+ References

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.4)
-URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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