Fair Value Measurement Fair Value Liabilities Measured on Recurring Basis, Unobservable Inputs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	[1]
Fair Value Disclosures [Abstract]
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss)	$ (47,400)
CONTINGENT EARN-OUT LIABILITY	$ 0	$ 47,400

[1] December 31, 2018 balances were derived from audited consolidated financial statements.