13. Segment Information  The Company operates under the following four operating segments: RE/MAX Franchising, Motto Franchising, Marketing Funds and booj. Due to quantitative insignificance, the booj operating segment does not meet the criteria of a reportable segment and is included in Other. Motto Franchising does not meet the quantitative significance test; however, management has chosen to report results for the segment as it believes it will be a key driver of future success for Holdings. Management evaluates the operating results of its segments based upon revenue and adjusted earnings before interest, the provision for income taxes, depreciation and amortization and other non-cash and non-recurring cash charges or other items (Adjusted EBITDA). The Companys presentation of Adjusted EBITDA may not be comparable to similar measures used by other companies. Except for the adjustments identified below in arriving at Adjusted EBITDA, the accounting policies of the reportable segments are the same as those described in the Companys 2019 Annual Report on Form 10-K.  The following table presents revenue from external customers by segment (in thousands):                  Three Months Ended June 30,  Six Months Ended June 30,   2020  2019  2020  2019 Continuing franchise fees (a)  $ 15,795  $ 23,978  $ 38,672  $ 48,095 Annual dues   8,745   8,819   17,666   17,673 Broker fees (a)   10,426   13,459   19,870   22,047 Franchise sales and other revenue   3,405   4,129   12,068   12,394 Total RE/MAX Franchising   38,371   50,385   88,276   100,209 Continuing franchise fees   943   916   2,209   1,755 Franchise sales and other revenue   127   114   319   234 Total Motto Franchising   1,070   1,030   2,528   1,989 Marketing Funds fees (a)   11,765   18,060   29,287   36,832 Other   1,001   1,906   2,388   3,529 Total revenue  $ 52,207  $ 71,381  $ 122,479  $ 142,559 (a) Continuing franchise fees and Marketing Funds fees declined primarily due to the temporary COVID-19 related financial support programs offered to franchisees. Broker fees declined primarily due to reductions in home sale transactions due to the COVID-19 pandemic.  The following table presents a reconciliation of Adjusted EBITDA by segment to income before provision for income taxes (in thousands):                Three Months Ended June 30,  Six Months Ended June 30,   2020  2019  2020  2019 Adjusted EBITDA: RE/MAX Franchising  $ 19,318  $ 30,021  $ 40,049  $ 54,165 Adjusted EBITDA: Motto Franchising   (741)   (719)   (1,319)   (1,460) Adjusted EBITDA: Other   332   580   (282)   167 Adjusted EBITDA: Consolidated   18,909   29,882   38,448   52,872 Gain (loss) on sale or disposition of assets   11   16   22   (363) Equity-based compensation expense   (2,747)   (1,796)   (4,933)   (5,847) Acquisition-related expense (a)   (328)   (15)   (894)   (87) Gain on reduction in tax receivable agreement liability   (500)          Fair value adjustments to contingent consideration (b)   (150)   (415)   355   (345) Interest income   34   342   303   662 Interest expense   (2,187)   (3,154)   (4,869)   (6,309) Depreciation and amortization   (6,412)   (5,541)   (12,722)   (11,099) Income before provision for income taxes  $ 6,630  $ 19,319  $ 15,710  $ 29,484 (a) Acquisition-related expense includes legal, accounting, advisory and consulting fees incurred in connection with the acquisition and integration of acquired companies. (b) Fair value adjustments to contingent consideration include amounts recognized for changes in the estimated fair value of the contingent consideration liability. See Note 9, Fair Value Measurements for additional information.