NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS  As at 31 December 2013, the Group had a receivable balance of $11.7 million, which was outside normal trading  terms (the receivable was past due but not impaired), offset by a payable balance of $16.7 million to the same debtor  company (see Note 20 for additional information). The Company’s remaining Bakken assets were sold to the debtor  company in July 2014, for approximately $14.0 million, including the settlement of the net liability due to the debtor  company.  Due to the short-term nature of trade and other receivables, their carrying amounts are assumed to approximate  fair value. No receivables were outside of normal trading terms as at 31 December 2014.  - 80 -  2014 2013 Year ended 31 December  US$’000 US$’000 FINANCIAL ASSETS:  Current  Derivative financial instruments – commodity contracts 7,801  -  Non-current  Derivative financial instruments – commodity contracts  1,675  -  Derivative financial instruments – interest rate swaps  107  176  Total financial assets  9,583 FINANCIAL LIABILITIES:  Current  Derivative financial instruments – commodity contracts - (188)  Derivative financial instruments – interest rate swaps  (130)  (147)  Non-current  Derivative financial instruments – commodity contracts  - (31)  Total financial liabilities  (130) (366)  NOTE 13 – DERIVATIVE FINANCIAL INSTRUMENTS  2014 2013  Year ended 31 December  US$’000 US$’000  Oil, natural gas and NGL sales  13,246 23,364  Joint interest billing receivables  11,587  5,353  Commodity hedge contract receivables  1,153  -  Other  8  31  Total trade and other receivables  25,994 28,748  NOTE 12 – TRADE AND OTHER RECEIVABLES