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Retirement Benefits	12 Months Ended
Retirement Benefits	Dec. 31, 2011
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Retirement Benefits	Retirement benefits We provide a 401(k) retirement plan for all employees, and we match employee contributions 100%, up to 6% of each employee’s gross wages. At December 31, 2011, 2010, and 2009, there were 625, 595, and 563 employees, respectively, participating in the plan. Our contribution expense was $2,390, $2,360, and $1,865 for the years ended December 31, 2011, 2010 and 2009, respectively.

The entire disclosure for pension and other postretirement benefits.

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-Name Accounting Standards Codification

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