What was the change in Other long-term liabilities from 2018 to 2019?
{"Long-term taxes payable": {"2019": 37385, "2018": 36336}, "Deferred compensation (see Note 13)": {"2019": 39715, "2018": 40895}, "Deferred tax liabilities (see Note 16)": {"2019": 27785, "2018": 26339}, "Deferred revenue": {"2019": 8012, "2018": 5091}, "Asset retirement obligations liability (see Note 2)": {"2019": 4934, "2018": 4529}, "Defined benefit plan liabilities (see Note 14)": {"2019": 45862, "2018": 37528}, "Other long-term liabilities": {"2019": 2188, "2018": 1238}, "Total other long-term liabilities": {"2019": 165881, "2018": 151956}}
other_longterm_liabilities_2019 = df["Other long-term liabilities"]["2019"]
other_longterm_liabilities_2018 = df["Other long-term liabilities"]["2018"]
answer = other_longterm_liabilities_2019 - other_longterm_liabilities_2018