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Summary of Significant Accounting Principles and Practices - Newly Adopted and Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating Right-of-Use Assets, Net | $ 18,953 | $ 23,602 |
Total Lease Liability | 21,635 | 25,556 |
Property, Plant and Equipment, Net | (106,678) | (112,499) |
Total Lease Liability | $ 2,815 | $ 4,737 |
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating Right-of-Use Assets, Net |  |  | $ 18,400
Total Lease Liability |  |  | 18,500
Total Lease Liability |  |  | 6,500
Accounting Standards Update 2016-02 | Restatement Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Property, Plant and Equipment, Net |  |  | $ 3,500

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