BUSINESS INFORMATION (Details) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2016
USD ($)
item
|
Dec. 31, 2015
USD ($)
item
|
Dec. 31, 2014
USD ($)
item
|
|
| Business information | |||
| Total revenues | $ 613,373 | $ 551,863 | $ 518,750 |
| Total assets | $ 598,800 | $ 539,461 | |
| Client | Revenue | |||
| Business information | |||
| Number of clients | item | 0 | 0 | 0 |
| Client | Revenue | Minimum | |||
| Business information | |||
| Concentration risk (as a percent) | 10.00% | 10.00% | 10.00% |
| United States | |||
| Business information | |||
| Total revenues | $ 516,688 | $ 443,998 | $ 409,935 |
| Total assets | 506,748 | 463,984 | |
| Europe | |||
| Business information | |||
| Total revenues | 54,332 | 88,063 | 89,797 |
| Total assets | 31,341 | 45,067 | |
| Rest Of World | |||
| Business information | |||
| Total revenues | 42,353 | 19,802 | $ 19,018 |
| Total assets | $ 60,711 | $ 30,410 | |