Significant Customers & Concentration of Credit Risk (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Concentration Risk [Line Items]
Unbilled accounts receivable	$ 96,793		$ 99,638
Single Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%
Unbilled accounts receivable	$ 11,700
Single Financial Services Customer [Member]
Concentration Risk [Line Items]
Unbilled accounts receivable	$ 34,700
Revenue [Member] | Single Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	11.00%
Revenue [Member] | Single Financial Services Customer [Member]
Concentration Risk [Line Items]
Concentration risk percentage	14.00%
Revenue [Member] | Automotive Industry [Member]
Concentration Risk [Line Items]
Concentration risk percentage	18.00%	14.00%
Revenue [Member] | Financial & Insurance Industry [Member] [Member]
Concentration Risk [Line Items]
Concentration risk percentage	22.00%	15.00%
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	25.00%