Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Taxes (Textuals) [Abstract]
Provision for income taxes	$ 9,182,000	$ 6,000,000	$ 16,971,000	$ 9,563,000
Unrecognized tax benefits including interest and penalties	13,300,000		13,300,000		12,000,000
Interest accrued	1,200,000		1,200,000		1,100,000
Minimum decrease in unrecognized tax benefits due to tax settlement	500,000		500,000
Maximum decrease in unrecognized tax benefits due to tax settlement	$ 1,500,000		$ 1,500,000
Tax holiday entitlement			In addition, in 2009 the Company established a new India unit in a Special Economic Zone ("SEZ") which is entitled to a five year, 100% tax holiday. Immediately following the expiration of the 100% tax holiday, the SEZ unit is entitled to a five year, 50% tax holiday.
Tax holidays for business located in Bangalore and Noida, India, expired			31.03.2011