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SEGMENTS INFORMATION - Major Customers (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Revenue, Major Customer [Line Items] |  |
Revenues | $ 324,651 | $ 264,482
Operating Segments |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 324,703 | 264,814
Operating Segments | Europe |  |
Revenue, Major Customer [Line Items] |  |
Revenues | $ 132,707 | $ 107,843
Sales Revenue, Net | Customer Concentration Risk | Operating Segments |  |
Revenue, Major Customer [Line Items] |  |
Number of customers | 0 |
Sales Revenue, Net | Customer Concentration Risk | Operating Segments | Europe | UBS AG |  |
Revenue, Major Customer [Line Items] |  |
Number of customers |  | 1
Revenues |  | $ 35,669
Accounts Receivable | Customer Concentration Risk | UBS AG | Billed Revenues |  |
Revenue, Major Customer [Line Items] |  |
Number of customers | 1 |
Concentration percentage | 11.90% |
Accounts Receivable | Customer Concentration Risk | Expedia | Unbilled Revenues |  |
Revenue, Major Customer [Line Items] |  |
Number of customers | 1 |
Concentration percentage | 10.30% |

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