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Supplemental Consolidated Balance Sheet Information (Components of Prepaid Expenses and Other Current Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Supplemental Consolidated Balance Sheet Information [Abstract]    
Notes receivable - current $ 7,701 $ 7,579
Other prepaid expenses and other current assets 17,353 15,187
Prepaid expenses and other current assets $ 25,054 $ 22,766