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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2013
Employee Benefit Plans [Abstract]
Employee Benefit Plans	10. 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 $19.9 million, $19.9 million and $18.6 million during 2013, 2012 and 2011, respectively. The company also has two overfunded defined benefit plans that were frozen upon acquisition in a 1994 business combination. As of December 31, 2013 and 2012, the company had recorded a $4.9 million and $2.7 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, 2013 and 2012, liabilities related to this plan totaling $13.5 million and $11.7 million, respectively, were included in accrued expenses.