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Contracts with Customers - Summary of Changes in Contract Assets and Contract Liabilities (Parenthetical) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2018
Revenue From Contract With Customer [Abstract] |  |
Reversal for provision for contract losses | $ 0 | $ 133,180
Increase in revenue recorded in other income |  | $ 55,100

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