OPERATING AND GEOGRAPHICAL SEGMENTS 2 (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Geographic sources of revenue and locations of long-lived assets
Net revenue	$ 347,816,000	$ 368,200,000	$ 676,959,000	$ 726,037,000
Long-lived assets	243,421,000		243,421,000		240,629,000
Exclusions from long-lived assets
Fair value of investment	3,657,000		3,657,000		3,753,000
Goodwill	104,501,000		104,501,000		104,430,000
Intangible assets, net	31,566,000		31,566,000		27,257,000
Non-current deferred tax assets(3)	121,400,000		121,400,000		102,300,000
Auction-rate securities
Exclusions from long-lived assets
Fair value of investment	1,066,000		1,066,000		1,066,000
United States
Geographic sources of revenue and locations of long-lived assets
Net revenue	45,213,000	59,170,000	89,394,000	107,360,000
Long-lived assets	103,102,000		103,102,000		85,044,000
Philippines
Geographic sources of revenue and locations of long-lived assets
Long-lived assets	55,120,000		55,120,000		61,594,000
Germany
Geographic sources of revenue and locations of long-lived assets
Net revenue	51,521,000	56,979,000	100,105,000	107,904,000
Long-lived assets	22,886,000		22,886,000		17,602,000
FRANCE
Geographic sources of revenue and locations of long-lived assets
Net revenue	11,802,000	9,932,000	17,873,000	19,649,000
Long-lived assets	22,178,000		22,178,000		28,000,000
Japan
Geographic sources of revenue and locations of long-lived assets
Net revenue	8,745,000	24,846,000	18,903,000	34,519,000
China, including Hong Kong
Geographic sources of revenue and locations of long-lived assets
Net revenue	107,211,000	66,994,000	205,901,000	151,093,000
Singapore
Geographic sources of revenue and locations of long-lived assets
Net revenue	10,068,000	10,025,000	18,795,000	19,931,000
South Korea
Geographic sources of revenue and locations of long-lived assets
Net revenue	36,899,000	36,550,000	80,110,000	98,691,000
Taiwan
Geographic sources of revenue and locations of long-lived assets
Net revenue	10,504,000	46,727,000	23,796,000	66,598,000
Asia-Pacific
Geographic sources of revenue and locations of long-lived assets
Long-lived assets	30,687,000		30,687,000		38,842,000
Rest of Asia-Pacific
Geographic sources of revenue and locations of long-lived assets
Net revenue	32,507,000	12,361,000	55,312,000	29,571,000
Rest of Europe
Geographic sources of revenue and locations of long-lived assets
Net revenue	28,995,000	37,421,000	57,388,000	76,153,000
Long-lived assets	9,448,000		9,448,000		9,547,000
Rest of the World
Geographic sources of revenue and locations of long-lived assets
Net revenue	$ 4,351,000	$ 7,195,000	$ 9,382,000	$ 14,568,000