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Goodwill
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill

There were no changes in goodwill during the years ended December 31, 2018 and 2017. As of December 31, 2018 and 2017, goodwill was not impaired and there were no accumulated impairment losses.