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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2021
Income Tax Disclosure [Abstract] |
Schedule of differences between income tax provision (benefit) at U.S. statutory rate and actual income tax provision (benefit) | The primary differences between the income tax provision (benefit) at the U.S. statutory rate and our actual income tax benefit are as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | ​ | Six Months Ended |  | ​
​ | ​ | June 30, | ​ | ​ | June 30, |  | ​
​ |  | 2021 |  | 2020 |  | ​ | 2021 |  | 2020 |  | ​
Taxes at U.S. statutory rate | ​ | $ | (3,287) |  | 21.0 | % | $ | 1,087 |  | 21.0 | % | ​ | $ | (3,903) |  | 21.0 | % | $ | (6,267) |  | 21.0 | % | ​
Foreign tax provision | ​ |  | (527) |  | 3.4 | ​ |  | (2,166) |  | (41.8) | ​ | ​ |  | (1,465) |  | 7.9 | ​ |  | (1,116) |  | 3.7 | ​ | ​
CARES Act | ​ |  | — |  | — | ​ |  | 580 |  | 11.2 | ​ | ​ |  | — |  | — | ​ |  | (5,234) |  | 17.6 | ​ | ​
Subsidiary restructuring | ​ |  | — |  | — | ​ |  | — |  | — | ​ | ​ |  | — |  | — | ​ |  | (8,333) |  | 27.9 | ​ | ​
Other (1) | ​ |  | 1,846 |  | (11.8) | ​ |  | 228 |  | 4.4 | ​ | ​ |  | 3,516 |  | (18.9) | ​ |  | (414) |  | 1.4 | ​ | ​
Income tax benefit (2) | ​ | $ | (1,968) |  | 12.6 | % | $ | (271) |  | (5.2) | % | ​ | $ | (1,852) |  | 10.0 | % | $ | (21,364) |  | 71.6 | % | ​
(1) | Includes interim period allocations of $1.6 million and $2.8 million, respectively, for the three- and six-month periods ended June 30, 2021.
(2) | The negative effective tax rate for the three-month period ended June 30, 2020 was driven by tax benefits of foreign losses in relation to nominal pre-tax income.

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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