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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2011
Employee Benefit Plans [Abstract]
Employee Benefit Plans	11. Employee Benefit Plans The company has a defined contribution plan (the “Plan”) generally covering all full-time employees. Company contributions to the Plan are made based on plan provisions and at the discretion of the Board of Directors. The company made contributions of $18.6 million, $17.5 million and $16.3 million during 2011, 2010 and 2009, respectively. The company also has two overfunded defined benefit plans that were frozen upon acquisition in a 1994 business combination. As of December 31, 2011 and 2010, the company had recorded a $2.1 million and $3.9 million asset, respectively, in other non-current assets related to the pension plans. The plans are not significant to the accompanying consolidated financial statements taken as a whole; accordingly, additional related disclosures are omitted from these notes to the consolidated financial statements. The company has a deferred compensation plan for senior managers and executive officers. At December 31, 2011 and 2010, liabilities related to this plan totaling $10.3 million and $9.5 million, respectively, were included in accrued expenses.