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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2019
Accumulated Other Comprehensive Income |
Summary of activity for changes in accumulated other comprehensive income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Foreign | ​ | Total Accumulated Other
​ | ​ | Currency (1) | ​ | Comprehensive Income
Accumulated other comprehensive income, balance at December 31, 2017 | ​ | $ | — | ​ | $ | —
Change in accumulated other comprehensive income | ​ | ​ | — | ​ | ​ | —
Accumulated other comprehensive income, balance at December 31, 2018 | ​ | ​ | — | ​ | ​ | —
Change in accumulated other comprehensive income | ​ | ​ | 4,890 | ​ | ​ | 4,890
Accumulated other comprehensive income, balance at December 31, 2019 | ​ | $ | 4,890 | ​ | $ | 4,890
(1) | Foreign currency is not shown net of additional U.S. tax, as other basis differences of non-U.S. subsidiaries are intended to be permanently reinvested.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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