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Income Taxes (Details 3)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Reconciliation to effective federal income tax rate    
Federal statutory rate 34.00% (35.00%)
Stock options 4.90% 4.60%
State taxes 1.60% 0.10%
Other permanent differences 0.70% 1.10%
Impact of uncertain tax positions 1.20% 0.90%
Other 0.70% 0.20%
Effective federal income tax rate 43.10% (28.10%)