| (Dollars in thousands) | Carrying amount | |||||||
| Financial assets | 2017 | 2016 | ||||||
| Cash and cash equivalents* | 77,292 | 109,295 | ||||||
| Accounts receivable and accrued revenues | 42,212 | 34,461 | ||||||
| Total | $ | 119,504 | $ | 143,756 | ||||
| Financial liabilities | 2017 | 2016 | ||||||
| Accounts payables and accrued expenses | 17,427 | $ | 12,378 | |||||
| Derivative financial liabilities, current | 545 | 2,257 | ||||||
| Current portion long-term debt | 65,053 | 57,521 | ||||||
| Long-term debt | 721,151 | 643,974 | ||||||
| Derivative financial liabilities, non-current | - | 442 | ||||||
| Total financial liabilities | $ | 804,177 | $ | 716,572 | ||||