Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

v2.4.0.8
Income Taxes (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Tax Expense (Benefit) [Abstract]        
Effective Income Tax Rate, Continuing Operations 37.90% 38.10% 37.90% 38.00%
Income Tax Expense (Benefit) $ 26,367,000 $ 21,882,000 $ 45,692,000 $ 38,518,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate     35.00%  
Minimum [Member]
       
Income Tax Contingency [Line Items]        
Gain Contingency, Unrecorded Amount 0   0  
Maximum [Member]
       
Income Tax Contingency [Line Items]        
Gain Contingency, Unrecorded Amount $ 5,000,000   $ 5,000,000