Significant Customers & Concentration of Credit Risk (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Concentration Risk [Line Items]
Unbilled accounts receivable	$ 99,828		$ 131,852
Single Customer
Concentration Risk [Line Items]
Concentration risk percentage	15.00%
Unbilled accounts receivable	$ 15,100
Single Financial Services Customer
Concentration Risk [Line Items]
Unbilled accounts receivable	$ 8,700
Revenue | Single Customer | Automotive Industry
Concentration Risk [Line Items]
Concentration risk percentage	13.00%	14.00%
Revenue | Single Financial Services Customer | Financial & Insurance Industry [Member]
Concentration Risk [Line Items]
Concentration risk percentage	9.00%	11.00%
Revenue | Automotive Industry
Concentration Risk [Line Items]
Concentration risk percentage	24.00%	29.00%
Revenue | Financial & Insurance Industry [Member]
Concentration Risk [Line Items]
Concentration risk percentage	16.00%	15.00%
Revenue | US Government [Member]
Concentration Risk [Line Items]
Concentration risk percentage	11.00%	8.00%
Accounts Receivable | Single Financial Services Customer
Concentration Risk [Line Items]
Concentration risk percentage	6.00%