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Debt and liquidity (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Long-term Debt and Capital Lease Obligations [Abstract] |  |
Schedule Of Long-Term Debt | The following table presents our long-term debt:
| As of June 30, 2018 |  | As of December 31, 2017
| (Dollars in thousands)
Old Credit Facility (Old Revolving Facility and Old Term Loan Facility) | $ | — |  |  | $ | 58,192 |
Senior Notes | — |  |  | 280,586 |
2018 Credit Facility (2018 Term Loan and 2018 Revolving Facility) | 2,209,075 |  |  | — |
Other Debt | 931 |  |  | 596 |
Total Debt | 2,210,006 |  |  | 339,374 |
Less: Short-term Debt | (106,378 | ) |  | (16,474 | )
Long-term Debt | $ | 2,103,628 |  |  | $ | 322,900 |
​ | ​ | ​ | ​ | ​ | ​
|  | As of December 31, 2017 |  | As of December 31, 2016 |
​ | ​ | ​ | ​ | ​ | ​
|  | (Dollars in thousands) |
Credit Facility (revolving facility and term loan facility) |  | $ | 58,192 |  | $ | 90,731 |
Senior Notes |  | 280,586 |  | 274,132 |
Other Debt |  | 596 |  | 569 |
​ | ​ | ​ | ​ | ​ | ​
Total Debt |  | 339,374 |  | 365,432 |
Less: Short-term Debt |  | (16,474 | ) | (8,852 | )
​ | ​ | ​ | ​ | ​ | ​
Long-term Debt |  | $ | 322,900 |  | $ | 356,580 |
​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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