Significant Customers & Concentration of Credit Risk (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Concentration Risk [Line Items]
Unbilled accounts receivable	$ 100,273		$ 105,549
Single Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage		10.00%
Unbilled accounts receivable	14,500
Single Financial Services Customer [Member]
Concentration Risk [Line Items]
Unbilled accounts receivable	$ 31,800
Revenue [Member] | Single Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	13.00%	13.00%
Revenue [Member] | Single Financial Services Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	15.00%
Revenue [Member] | Automotive Industry [Member]
Concentration Risk [Line Items]
Concentration risk percentage	22.00%	20.00%
Revenue [Member] | Financial & Insurance Industry [Member]
Concentration Risk [Line Items]
Concentration risk percentage	20.00%	22.00%
Accounts Receivable [Member] | Single Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	14.00%
Accounts Receivable [Member] | Single Financial Services Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	22.00%