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Income Taxes (Schedule of Non-Current Income Taxes Receivable and Deferred) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Abstract]    
Income taxes receivable $ 16,751 $ 16,516
Deferred income taxes 107,135 118,128
Total noncurrent deferred taxes and taxes receivable $ 123,886 $ 134,644