On January 1, 2013, Credit Inc. recorded goodwill valued at $270,000 when it acquired the assets of another company. At the end of 2014, the auditors of Credit Inc. determined that the goodwill had been impaired by $50,000 and Credit Inc. wrote down the book value of the goodwill by $50,000. During 2015, the goodwill was not further impaired. In 2016, additional goodwill was impaired and was written down another $18,000 for financial reporting purposes. What is the temporary book-tax difference associated with the purchased goodwill in 2014, 2015, and 2016? Are the differences favorable or unfavorable? Are the differences permanent or temporary?