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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Line Items]      
U.S. federal tax statutory rate 35.00% 35.00%  
State income taxes, net of federal income tax benefit, Rate 2.38% 2.75%  
Pass-through loss prior to IPO not subject to federal tax, Rate   3.85%  
Initial deferred tax expense, Rate   268.43%  
Non-deductible stock-based compensation, Rate   10.08%  
Annual effective tax expense, Total 37.08% 323.83%  
U.S. federal tax statutory rate, Amount $ 44,163 $ 4,644  
State income taxes, net of federal income tax benefit, Amount 3,004 364  
Pass-through loss prior to IPO not subject to federal tax, Amount   511  
Initial deferred tax expense, Amount   35,612  
Non-deductible stock-based compensation, Amount   1,338  
Annual effective tax expense, Total amount 46,789 42,962   
IPO [Member]
      
Income Taxes [Line Items]      
Non-deductible IPO costs and other, Rate (0.30%) 3.72%  
Non-deductible IPO costs and other, Amount $ (378) $ 493