Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Employee contribution percentage	60.00%
Employee contribution amount	$ 16,500
Contribution expense recognized by Indian entities	538,000	421,000
Provident Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution expense recognized by Indian entities	3,280,000	2,790,000	1,980,000
Gratuity Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution expense recognized by Indian entities	2,300,000	1,450,000	980,000
Accrued liability for retirement plan	$ 5,600,000	$ 5,300,000