Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Tax Expense (Benefit) [Abstract]    
Income Tax Expense (Benefit) $ 19,325 $ 16,637
Effective Income Tax Rate, Continuing Operations 38.00% 37.90%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00%