Commitments and Contingencies (Narrative) (Details)			1 Months Ended	12 Months Ended
	Apr. 05, 2019 USD ($)	Jun. 10, 2013 complaint	May 31, 2013 complaint	Dec. 31, 2020 USD ($) $ / Person	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Commitments and Contingencies [Line Items]
Number of class action complaints filed | complaint		12	12
Contingent Earn-Out Provision				$ 0	$ 10,095,000	$ 24,976,000
Contingent liability for earn-out acquisition consideration				0	1,474,000
Contingent liability for earn-out acquisition consideration				0	8,621,000
Self-insured health insurance, liability				345,000	362,000
Health insurance expenses, claims of self Insured plan				1,800,000	2,600,000
India*
Commitments and Contingencies [Line Items]
Self-insured health insurance, liability				$ 4,300,000	3,200,000
Maximum
Commitments and Contingencies [Line Items]
Self-insured health insurance limit, per person | $ / Person				120,000
Self-insured health Insurance, aggregate liability based on participants and claims (percentage)				125.00%
Self-insured health insurance, estimated cumulative liability for annual contract				$ 4,100,000
Maximum | India*
Commitments and Contingencies [Line Items]
Self-insured health insurance limit, per person | $ / Person				28,000
Contingent Accrued Earn-out Acquisition Consideration
Commitments and Contingencies [Line Items]
Contingent Earn-Out Provision				$ 0	$ 10,100,000
Settled Litigation
Commitments and Contingencies [Line Items]
Loss contingency, legal expenses sought to be paid	$ 19,650,000