What is the increase/ (decrease) in Initial direct costs and other from December 31, 2019 to December 31, 2018?
{"": {"December 31, 2019": "$", "December 31, 2018": "$"}, "Total minimum lease payments to be received": {"December 31, 2019": 1115968, "December 31, 2018": 897130}, "Estimated unguaranteed residual value of leased properties": {"December 31, 2019": 284277, "December 31, 2018": 291098}, "Initial direct costs and other": {"December 31, 2019": 296, "December 31, 2018": 329}, "Less unearned revenue": {"December 31, 2019": -581732, "December 31, 2018": -613394}, "Total": {"December 31, 2019": 818809, "December 31, 2018": 575163}, "Less current portion": {"December 31, 2019": -273986, "December 31, 2018": -12635}, "Long-term portion": {"December 31, 2019": 544823, "December 31, 2018": 562528}}
initial_direct_cost_2019 = df["Initial direct costs and other"]["December 31, 2019"]
initial_direct_cost_2018 = df["Initial direct costs and other"]["December 31, 2018"]
answer = initial_direct_cost_2019 - initial_direct_cost_2018