Basis of Presentation and Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Jan. 01, 2019 |
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| Related Party Transaction [Line Items] | ||||||
| Bad debt expense | $ 266 | $ 53,790 | ||||
| Oil And Natural Gas Industry | ||||||
| Related Party Transaction [Line Items] | ||||||
| Bad debt expense | 300 | $ 1,400 | ||||
| Puerto Rico Electric Power Authority (PREPA) | ||||||
| Related Party Transaction [Line Items] | ||||||
| Interest income, other | $ 3,200 | $ 29,000 | ||||
| Bad debt expense | $ 16,000 | |||||
| Non-Employees | Accounting Standards Update 2018-07 | Payout Provision | ||||||
| Related Party Transaction [Line Items] | ||||||
| Estimated fair value of non-employee awards | $ 18,900 | |||||
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- Definition Accounts Receivable, Impaired, Interest Charge No definition available.
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- Definition Share-based Goods and Nonemployee Services Transaction, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options No definition available.
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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