pre_text: NAVIOS MARITIME HOLDINGS INC. NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS (Expressed in thousands of U.S. dollars — except share data) NOTE 8: INTANGIBLE ASSETS/LIABILITIES OTHER THAN GOODWILL Net Book Value of Intangible Assets other than Goodwill as at December 31, 2018 (**) During the year ended December 31, 2018, acquisition costs of $1,150 of favorable lease terms were capitalized as part of the cost of one vessel due to the exercise of the purchase option (See also Note 2(n)). As of December 31, 2018, intangible assets associated with the favorable lease terms included an amount of $31,342 associated with the favorable lease terms of certain charter out contracts of Navios Containers which were recognized as of November 30, 2018 (see Note 3). During the year ended December 31, 2017, acquisition costs of $10,398 and accumulated amortization of $7,001 of favorable lease terms were considered impaired and were written off resulting in a loss of $3,397 included in the statement of comprehensive (loss)/income within the caption of “Impairment loss/ loss on sale of vessels, net”.
table: Acquisition Cost Accumulated Amortization Transfer/ Write off Net Book Value December 31, 2018
table: Trade name $100,420 $(47,966) $— $52,454
table: Port terminal operating rights 53,152 (11,838) — 41,314
table: Customer relationships 35,490 (19,520) — 15,970
table: Favorable lease terms(**) 32,492 (2,143) (1,150) 29,199
table: Total Intangible assets $221,554 $(81,467) $(1,150) $138,937
question: Analyse this data from a financial earnings document. What was the difference between the accumulated amortization between Customer relationships and favorable lease terms?