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Accrued and Other Current Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Payables and Accruals [Abstract]    
Accrued payroll and other compensation $ 91,064 $ 117,013
Accrued insurance 21,459 19,284
Other current liabilities 63,732 75,189
Accrued and other current liabilities $ 176,255 $ 211,486