Amount of long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets, located in the entity's country of domicile.

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Revenues from external customers attributed to the entity's country of domicile.

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Geographic Data (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
Geographic Data (Details) (USD $) In Thousands	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Service revenues:
United States	$ 155,698	$ 118,517	$ 300,258	$ 223,951
International	98,918	81,834	195,698	159,623
Total service revenues	254,616	200,351	495,956	383,574
Long-lived tangible assets:
Long-lived tangible assets, United States	19,827		19,827		14,792
Total long-lived tangible assets	49,032		49,032		35,571
United Kingdom [Member]
Long-lived tangible assets:
Long-lived tangible assets	4,881		4,881		3,936
India [Member]
Long-lived tangible assets:
Long-lived tangible assets	19,518		19,518		13,771
Rest of International [Member]
Long-lived tangible assets:
Long-lived tangible assets	$ 4,806		$ 4,806		$ 3,072