OPERATING AND GEOGRAPHICAL SEGMENTS (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Geographic sources of revenues and locations of long-lived assets
Net revenues	$ 1,803,053,000	$ 1,644,060,000	$ 1,217,345,000
Long-lived assets	274,507,000	281,775,000
Exclusions from long-lived assets
Auction-rate securities	2,251,000	2,251,000
Goodwill	67,662,000	54,676,000
Intangible assets, net	20,594,000	17,603,000
Deferred income tax assets	121,400,000	140,600,000
Auction-rate securities
Exclusions from long-lived assets
Auction-rate securities	2,251,000	2,251,000
United States
Geographic sources of revenues and locations of long-lived assets
Net revenues	249,887,000	260,091,000	209,494,000
Long-lived assets	81,777,000	106,052,000
Germany
Geographic sources of revenues and locations of long-lived assets
Net revenues	237,777,000	207,305,000	167,808,000
Long-lived assets	20,681,000	18,963,000
France
Geographic sources of revenues and locations of long-lived assets
Net revenues	31,231,000	55,107,000	73,926,000
Long-lived assets	30,277,000	30,674,000
Japan
Geographic sources of revenues and locations of long-lived assets
Net revenues	57,376,000	46,671,000	35,691,000
China, including Hong Kong
Geographic sources of revenues and locations of long-lived assets
Net revenues	531,561,000	489,480,000	342,172,000
Singapore
Geographic sources of revenues and locations of long-lived assets
Net revenues	42,982,000	42,819,000	54,221,000
Taiwan
Geographic sources of revenues and locations of long-lived assets
Net revenues	135,650,000	115,559,000	71,206,000
South Korea
Geographic sources of revenues and locations of long-lived assets
Net revenues	223,967,000	143,213,000	46,220,000
Philippines [Member]
Geographic sources of revenues and locations of long-lived assets
Long-lived assets	71,332,000	65,049,000
Asia-Pacific
Geographic sources of revenues and locations of long-lived assets
Long-lived assets	59,906,000	47,524,000
Rest of Asia-Pacific
Geographic sources of revenues and locations of long-lived assets
Net revenues	71,048,000	70,958,000	57,791,000
Rest of Europe
Geographic sources of revenues and locations of long-lived assets
Net revenues	193,558,000	177,274,000	139,244,000
Long-lived assets	10,534,000	13,513,000
Rest of the World
Geographic sources of revenues and locations of long-lived assets
Net revenues	$ 28,016,000	$ 35,583,000	$ 19,572,000