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Note 14 - Income Taxes (Detail) - Tax Rate Reconciliation (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal tax provision at statutory rate	$ 44,723	$ 30,895	$ 7,774
State taxes, net of federal income tax benefit	4,772	3,021	973
Non-deductible expenses	618	208	223
Permanent differences related to the employee stock purchase program	52	105	164
Release of valuation allowance	(1,200)	(346)
Other	97	(823)	(509)
Income tax provision	$ 49,062	$ 33,060	$ 8,625

X

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

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