Commitments and Contingencies Contingent Consideration (Acquisitions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition, Contingent Consideration [Line Items]
Current portion of contingent consideration	$ 5,987	$ 5,969
Contingent consideration non-current portion	5,909	10,566
Fair Value, Inputs, Level 3 [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	$ 1,405	$ 1,467	$ 1,114