OPERATING AND GEOGRAPHICAL SEGMENTS - Schedule of Long-lived Assets by Location (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Long-lived assets	$ 184,102	$ 206,285
United States
Segment Reporting Information [Line Items]
Long-lived assets	85,049	92,466
Philippines
Segment Reporting Information [Line Items]
Long-lived assets	57,579	56,094
Germany
Segment Reporting Information [Line Items]
Long-lived assets	8,300	17,920
France
Segment Reporting Information [Line Items]
Long-lived assets	11,125	13,714
Rest of Asia-Pacific
Segment Reporting Information [Line Items]
Long-lived assets	16,954	20,237
Rest of Europe
Segment Reporting Information [Line Items]
Long-lived assets	$ 5,095	$ 5,854