Provision For Doubtful Accounts	9 Months Ended
Sep. 30, 2011
Provision For Doubtful Accounts [Abstract]
Provision For Doubtful Accounts	6. Provision for Doubtful Accounts The provision for doubtful accounts is recorded after the related work has been billed to the client and we determine that full collectability is not reasonably assured. It is classified in "Selling, general and administrative expense" on the Condensed Consolidated Statements of Income. The provision for doubtful accounts totaled $3.7 million and $9.5 million for the three and nine months ended September 30, 2011, respectively, and $2.6 million and $7.2 million for the three and nine months ended September 30, 2010, respectively.

Provision For Doubtful Accounts

9 Months Ended

Sep. 30, 2011

Provision For Doubtful Accounts [Abstract]

6. Provision for Doubtful Accounts

The provision for doubtful accounts is recorded after the related work has been billed to the client and we determine that full collectability is not reasonably assured. It is classified in "Selling, general and administrative expense" on the Condensed Consolidated Statements of Income. The provision for doubtful accounts totaled $3.7 million and $9.5 million for the three and nine months ended September 30, 2011, respectively, and $2.6 million and $7.2 million for the three and nine months ended September 30, 2010, respectively.