What was the change in the Unrecognized tax benefits, end of period from 2018 to 2019?
{"": {"2019": "", "2018": "(In thousands)", "2017": ""}, "Unrecognized tax benefits, beginning of period": {"2019": 2735, "2018": 2714, "2017": 2055}, "Additions based on tax positions related to current year": {"2019": 371, "2018": 520, "2017": 730}, "Additions based on tax positions related to prior years": {"2019": 13, "2018": "\u2014", "2017": "\u2014"}, "2017 Tax Act and tax rate re-measurement  ": {"2019": "\u2014", "2018": -499, "2017": "\u2014"}, "Reductions based on tax positions related to prior years  ": {"2019": -17, "2018": "\u2014", "2017": "\u2014"}, "Lapses during the current year applicable to statutes of limitations  ": {"2019": "\u2014", "2018": "\u2014", "2017": -71}, "Unrecognized tax benefits, end of period": {"2019": 3102, "2018": 2735, "2017": 2714}}
unrecognized_tax_benefits_end_of_period_2019 = df["Unrecognized tax benefits, end of period"]["2019"]
unrecognized_tax_benefits_beginning_of_period_2019 = df["Unrecognized tax benefits, beginning of period"]["2019"]
answer = unrecognized_tax_benefits_end_of_period_2019 - unrecognized_tax_benefits_beginning_of_period_2019