Significant Customers & Concentration of Credit Risk (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Concentration Risk [Line Items]
Unbilled accounts receivable	$ 104,195		$ 131,852
Single Customer
Concentration Risk [Line Items]
Concentration risk percentage	13.00%
Unbilled accounts receivable	$ 13,600
Single Financial Services Customer
Concentration Risk [Line Items]
Unbilled accounts receivable	$ 12,400
Revenue | Single Customer | Automotive Industry
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	13.00%
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	25.00%	27.00%
Revenue | Financial & Insurance Industry [Member]
Concentration Risk [Line Items]
Concentration risk percentage	16.00%	15.00%
Accounts Receivable | Single Financial Services Customer
Concentration Risk [Line Items]
Concentration risk percentage	8.00%