10. Income Taxes (Details-Reconciliation) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Expense at federal tax rate	$ 18,285	$ 13,011	$ 3,215
State taxes, net of federal income tax effect	2,651	2,079	1,190
Other adjustments to tax reserve	(54)	(419)	(1,153)
Effect of change in state tax rate	144	(239)	(1,105)
Change in valuation allowance	0	0	(62,811)
Stock-based compensation	1,182	911	321
Non-deductible expenses	116	619	63
Other	402	206	59
Income tax expense/(benefit)	$ 22,726us-gaap_IncomeTaxExpenseBenefit	$ 16,168us-gaap_IncomeTaxExpenseBenefit	$ (60,221)us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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