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Summary of Significant Accounting Policies - Other Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Summary of Significant Accounting Policies |  |
Non-controlling investment | $ 1.8 | $ 1.8

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- Definition Original amount of cost-method investments at the acquisition date. + References No definition available. + Details
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