Goodwill and Intangible Assets, Net - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill at January 1, 2019		$ 133,031
Impairment	$ (8,800)	(8,849)	$ 0	$ 0
Goodwill at December 31, 2019	$ 124,182	$ 124,182	$ 133,031

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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