Fair Value Measurements - Reconciliation of Contingent Payments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Measurement period adjustments to acquisition-related contingent consideration	$ 0	$ (2,820)	$ 0	$ (2,820)
Change in fair value of acquisition-related contingent consideration	2,140	(1,810)	1,850	(1,810)
Contingent Consideration Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	12,650	15,990	12,940	0
Acquisition-related contingent consideration incurred during period	0	0	0	15,990
Change in fair value of acquisition-related contingent consideration	2,140	(1,810)	1,850	(1,810)
Ending balance	$ 14,790	$ 11,360	$ 14,790	$ 11,360

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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