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Significant Accounting Policies - Revenue Recognition (Details) | 12 Months Ended
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Dec. 31, 2018
Accounting Changes |
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true false] | true
Adjustments for adoption of guidance | ASU 2014-09, Revenue from Contracts with Customers |
Accounting Changes |
Billing retention recognized at time of transfer of control (as a percent) | 10.00%

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