OPERATING AND GEOGRAPHICAL SEGMENTS 2 (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Geographic sources of revenue and locations of long-lived assets
Net revenue	$ 329,143,000	$ 357,837,000
Long-lived assets	246,904,000		240,629,000
Exclusions from long-lived assets
Fair value of investment	3,192,000		3,753,000
Goodwill	104,581,000		104,430,000
Intangible assets, net	33,448,000		27,257,000
Non-current deferred tax assets(3)	115,400,000		102,300,000
Auction-rate securities
Exclusions from long-lived assets
Fair value of investment	1,066,000		1,066,000
United States
Geographic sources of revenue and locations of long-lived assets
Net revenue	44,181,000	48,190,000
Long-lived assets	94,624,000		85,044,000
Philippines
Geographic sources of revenue and locations of long-lived assets
Long-lived assets	57,446,000		61,594,000
Germany
Geographic sources of revenue and locations of long-lived assets
Net revenue	48,584,000	50,925,000
Long-lived assets	24,541,000		17,602,000
FRANCE
Geographic sources of revenue and locations of long-lived assets
Net revenue	6,071,000	9,717,000
Long-lived assets	26,851,000		28,000,000
Japan
Geographic sources of revenue and locations of long-lived assets
Net revenue	10,158,000	9,673,000
China, including Hong Kong
Geographic sources of revenue and locations of long-lived assets
Net revenue	98,690,000	84,099,000
Singapore
Geographic sources of revenue and locations of long-lived assets
Net revenue	8,727,000	9,906,000
South Korea
Geographic sources of revenue and locations of long-lived assets
Net revenue	43,211,000	62,141,000
Taiwan
Geographic sources of revenue and locations of long-lived assets
Net revenue	13,292,000	19,871,000
Asia-Pacific
Geographic sources of revenue and locations of long-lived assets
Long-lived assets	37,964,000		38,842,000
Rest of Asia-Pacific
Geographic sources of revenue and locations of long-lived assets
Net revenue	22,805,000	17,210,000
Rest of Europe
Geographic sources of revenue and locations of long-lived assets
Net revenue	28,393,000	38,732,000
Long-lived assets	5,478,000		9,547,000
Rest of the World
Geographic sources of revenue and locations of long-lived assets
Net revenue	$ 5,031,000	$ 7,373,000