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Note 13 - Income Taxes (Details) - Tax Rate Reconciliation (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Tax Rate Reconciliation [Abstract]      
Federal tax provision at statutory rate $ 58,026 $ 44,723 $ 30,895
State taxes, net of federal income tax benefit 3,141 4,772 3,021
Non-deductible expenses 1,010 618 208
Permanent differences related to the employee stock purchase program 55 52 105
Net change in valuation allowance (554) (1,200) (346)
General business credits (440)    
Other (664) 97 (823)
Income tax provision $ 60,574 $ 49,062 $ 33,060