Income Taxes	6 Months Ended
Jun. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	13. Income Taxes For the three and six months ended June 30, 2013 and 2012, income tax expense was primarily derived by applying the federal statutory rate of 35% to operating income before income taxes. During the second quarter of 2013, a release of the tax reserve against the federal tax credits taken on the 2009 income tax return, was recorded in the amount of $5.7 million. This resulted in a reduction to the tax expense for the quarter. In general, our income tax returns are subject to examination by tax authorities for tax years 1996 forward. The California Franchise Tax Board is currently examining the Company’s 2008, 2009 and 2010 tax returns. Although the timing of the resolution of income tax examinations is highly uncertain, and the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued for each year, we do not anticipate any material change to the amount of our unrecognized tax benefits over the next 12 months.

Income Taxes

6 Months Ended

Jun. 30, 2013

13. Income Taxes

For the three and six months ended June 30, 2013 and 2012, income tax expense was primarily derived by applying the federal statutory rate of 35% to operating income before income taxes.

During the second quarter of 2013, a release of the tax reserve against the federal tax credits taken on the 2009 income tax return, was recorded in the amount of $5.7 million. This resulted in a reduction to the tax expense for the quarter.

In general, our income tax returns are subject to examination by tax authorities for tax years 1996 forward. The California Franchise Tax Board is currently examining the Company’s 2008, 2009 and 2010 tax returns. Although the timing of the resolution of income tax examinations is highly uncertain, and the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued for each year, we do not anticipate any material change to the amount of our unrecognized tax benefits over the next 12 months.