OPERATING AND GEOGRAPHICAL SEGMENTS 2 (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Geographic sources of revenue and locations of long-lived assets
Net revenue	$ 337,361,000	$ 329,143,000
Long-lived assets	235,097,000		227,718,000
Exclusions from long-lived assets
Fair value of investment	1,066,000		3,247,000
Goodwill	108,599,000		108,240,000
Intangible assets, net of accumulated amortization of $49,464 and $47,747, respectively	26,406,000		28,116,000
Non-current deferred tax assets(3)	115,300,000		134,400,000
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	52,910,000	44,181,000
Long-lived assets	112,236,000		104,912,000
Philippines
Geographic sources of revenue and locations of long-lived assets
Long-lived assets	52,744,000		50,472,000
Germany
Geographic sources of revenue and locations of long-lived assets
Net revenue	59,261,000	48,584,000
Long-lived assets	23,982,000		24,244,000
FRANCE [Member]
Geographic sources of revenue and locations of long-lived assets
Net revenue	3,080,000	6,071,000
Long-lived assets	16,849,000		17,249,000
Japan
Geographic sources of revenue and locations of long-lived assets
Net revenue	5,540,000	10,158,000
China, including Hong Kong
Geographic sources of revenue and locations of long-lived assets
Net revenue	93,201,000	98,690,000
Singapore
Geographic sources of revenue and locations of long-lived assets
Net revenue	11,590,000	8,727,000
South Korea
Geographic sources of revenue and locations of long-lived assets
Net revenue	33,032,000	43,211,000
Taiwan
Geographic sources of revenue and locations of long-lived assets
Net revenue	10,718,000	13,292,000
Asia-Pacific
Geographic sources of revenue and locations of long-lived assets
Long-lived assets	21,671,000		23,815,000
Rest of Asia-Pacific
Geographic sources of revenue and locations of long-lived assets
Net revenue	24,022,000	22,805,000
Rest of Europe
Geographic sources of revenue and locations of long-lived assets
Net revenue	38,353,000	28,393,000
Long-lived assets	7,615,000		7,026,000
Rest of the World
Geographic sources of revenue and locations of long-lived assets
Net revenue	5,654,000	5,031,000
Recurring basis | Auction-rate securities
Geographic sources of revenue and locations of long-lived assets
Other Assets, Fair Value Disclosure	1,066,000		1,066,000
Recurring basis | Fair Value, Inputs, Level 3 [Member]
Geographic sources of revenue and locations of long-lived assets
Other Assets, Fair Value Disclosure	1,066,000		1,066,000
Recurring basis | Fair Value, Inputs, Level 3 [Member] | Auction-rate securities
Geographic sources of revenue and locations of long-lived assets
Other Assets, Fair Value Disclosure	$ 1,066,000