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Income Taxes (Schedule of Income before Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Beginning Balance $ 28,133 $ 20,677
Decreases related to tax positions taken during prior periods (320) (46)
Increases related to tax positions taken during prior periods 8,487  
Increases related to tax positions taken during the current period 7,037 10,739
Decreases related to expiration of statute of limitations   (3,237)
Ending Balance $ 43,337 $ 28,133