OPERATING AND GEOGRAPHICAL SEGMENTS Locations of long-lived assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Long-lived assets	$ 232,215	$ 227,718
United States
Segment Reporting Information [Line Items]
Long-lived assets	111,550	104,912
Philippines
Segment Reporting Information [Line Items]
Long-lived assets	53,353	50,472
Germany
Segment Reporting Information [Line Items]
Long-lived assets	23,170	24,244
FRANCE
Segment Reporting Information [Line Items]
Long-lived assets	16,318	17,249
Asia-Pacific
Segment Reporting Information [Line Items]
Long-lived assets	19,955	23,815
Rest of Europe
Segment Reporting Information [Line Items]
Long-lived assets	$ 7,869	$ 7,026