Significant Customers & Concentration of Credit Risk (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Concentration Risk [Line Items]
Unbilled accounts receivable	$ 86,483		$ 90,912
Single Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	10.00%
Unbilled accounts receivable	$ 10,300
Single Financial Services Customer [Member]
Concentration Risk [Line Items]
Unbilled accounts receivable	$ 28,300
Revenue [Member] | Single Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	13.00%	7.00%
Revenue [Member] | Single Financial Services Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	15.00%	15.00%
Revenue [Member] | Automotive Industry [Member]
Concentration Risk [Line Items]
Concentration risk percentage	20.00%	13.00%
Revenue [Member] | Financial & Insurance Industry [Member] [Member]
Concentration Risk [Line Items]
Concentration risk percentage	22.00%	24.00%
Accounts Receivable [Member] | Single Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	12.00%
Accounts Receivable [Member] | Single Financial Services Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	22.00%