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Accrued and Other Current Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Payables and Accruals [Abstract]    
Accrued payroll and other compensation $ 84,569 $ 108,612
Accrued insurance 23,283 22,235
Other current liabilities 65,809 61,437
Accrued and other current liabilities $ 173,661 $ 192,284