OPERATING AND GEOGRAPHICAL SEGMENTS (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Geographic sources of revenue and locations of long-lived assets
Net revenue	$ 360,990,000	$ 479,375,000	$ 1,087,027,000	$ 1,419,444,000
Long-lived assets	250,557,000		250,557,000		274,507,000
Exclusions from long-lived assets
Investment Owned, at Fair Value	3,202,000		3,202,000		5,330,000
Goodwill	69,243,000		69,243,000		67,662,000
Intangible assets, net	13,782,000		13,782,000		20,594,000
Deferred income tax assets	127,100,000		127,100,000		121,400,000
Auction-rate securities
Exclusions from long-lived assets
Investment Owned, at Fair Value	1,066,000		1,066,000		2,251,000
United States
Geographic sources of revenue and locations of long-lived assets
Net revenue	49,757,000	57,254,000	146,340,000	192,109,000
Long-lived assets	85,657,000		85,657,000		81,777,000
Philippines
Geographic sources of revenue and locations of long-lived assets
Long-lived assets	63,558,000		63,558,000		71,332,000
Germany
Geographic sources of revenue and locations of long-lived assets
Net revenue	39,773,000	58,669,000	137,186,000	178,068,000
Long-lived assets	18,552,000		18,552,000		20,681,000
France
Geographic sources of revenue and locations of long-lived assets
Net revenue	4,998,000	6,350,000	22,728,000	23,769,000
Long-lived assets	25,875,000		25,875,000		30,277,000
Japan
Geographic sources of revenue and locations of long-lived assets
Net revenue	13,331,000	15,342,000	37,796,000	44,895,000
China, including Hong Kong
Geographic sources of revenue and locations of long-lived assets
Net revenue	121,513,000	157,284,000	326,772,000	427,956,000
Singapore
Geographic sources of revenue and locations of long-lived assets
Net revenue	10,762,000	11,626,000	31,796,000	34,915,000
South Korea
Geographic sources of revenue and locations of long-lived assets
Net revenue	43,536,000	67,544,000	143,474,000	170,449,000
Taiwan
Geographic sources of revenue and locations of long-lived assets
Net revenue	14,615,000	30,943,000	49,870,000	124,837,000
Asia-Pacific
Geographic sources of revenue and locations of long-lived assets
Long-lived assets	46,274,000		46,274,000		59,906,000
Rest of Asia-Pacific
Geographic sources of revenue and locations of long-lived assets
Net revenue	18,885,000	17,890,000	50,879,000	52,246,000
Rest of Europe
Geographic sources of revenue and locations of long-lived assets
Net revenue	37,447,000	48,859,000	118,189,000	149,920,000
Long-lived assets	10,641,000		10,641,000		10,534,000
Rest of the World
Geographic sources of revenue and locations of long-lived assets
Net revenue	$ 6,373,000	$ 7,614,000	$ 21,997,000	$ 20,280,000