Basis of Presentation and Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Thousands |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2018 |
Dec. 31, 2017 |
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| Allowance for Doubtful Accounts Receivable [Roll Forward] | ||
| Balance, Period Start | $ 21,737 | $ 5,377 |
| Additions charged to expense | 53,790 | 16,206 |
| Additions other | 179 | |
| Deductions for uncollectible receivables written off | (1,758) | (25) |
| Balance, Period End | $ 73,769 | $ 21,737 |
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- Definition Allowance for Doubtful Accounts Receivable, Other No definition available.
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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