NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Risks and Uncertainties) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Revenues	$ 730,027,000	$ 555,117,000	$ 433,799,000
Customer Concentration Risk | Unbilled Revenues | UBS AG
Concentration Risk [Line Items]
Concentration risk percentage	16.50%
Number of customers	1
Customer Concentration Risk | Accounts Receivable Billed
Concentration Risk [Line Items]
Number of customers	0
Customer Concentration Risk | Sales Revenue, Net
Concentration Risk [Line Items]
Number of customers		0
Customer Concentration Risk | Sales Revenue, Net | UBS AG
Concentration Risk [Line Items]
Number of customers	1
Revenues	97,600,000
Customer Concentration Risk | Sales Revenue, Net | Top Five Customers
Concentration Risk [Line Items]
Concentration risk percentage	32.80%	30.60%	31.00%
Number of customers	5
Revenues	239,396,000	169,987,000	134,484,000
Customer Concentration Risk | Sales Revenue, Net | Top Ten Customers
Concentration Risk [Line Items]
Concentration risk percentage	43.90%	42.30%	44.40%
Number of customers	10
Revenues	320,126,000	234,955,000	192,426,000
Supplier Concentration Risk | Cost of Goods Sold and Sales, General and Administrative Expenses
Concentration Risk [Line Items]
Subcontractor costs	1,885,000	2,078,000	3,535,000
CIS Countries | Geographic Concentration Risk | Assets, Total
Concentration Risk [Line Items]
Cash	59,300,000
Belarus | Geographic Concentration Risk | Assets, Total
Concentration Risk [Line Items]
Cash	$ 34,200,000