Accounting Policies (Schedule of Foreign Currency Gains on Long-term Intercompany Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Gain (before tax) on long-term intercompany loan	$ (4,985)	$ 0	$ 0

Current period adjustment resulting from gains and losses on intercompany foreign currency transactions that are of a long-term-investment nature because settlement is not planned or anticipated in the foreseeable future. Resulting from the entities to the transaction being consolidated, combined, or accounted for by the equity method in the reporting entity's financial statements.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 35
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121605123&loc=d3e30304-110892

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900

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