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Receivables and Allowances for Credit Losses (Tables) | 6 Months Ended
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Jun. 30, 2020
Receivables and Allowances for Credit Losses |
Schedule of allowances for credit losses related to trade receivables | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ | ​ | 2020 | ​ | 2020 | ​
​ | ​ | (in thousands) | ​
Balance at January 1 (beginning of year) | ​ | $ | — | ​ | $ | 818 | ​
Provision for credit losses | ​ | ​ | — | ​ | ​ | — | ​
Charge-offs | ​ | ​ | — | ​ | ​ | (818) | ​
Recoveries | ​ | ​ | — | ​ | ​ | — | ​
Balance at June 30 (end of period) | ​ | $ | — | ​ | $ | — | ​

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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