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Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income taxes	Income taxes Our effective tax rate for the three and nine months ended September 30, 2019 was 25.4% and 24.6%, respectively, compared to 24.7% and 23.0%, respectively, for the same periods in 2018. Our effective tax rate for the three and nine months ended September 30, 2019 differs from the federal statutory rate primarily due to state income tax expense on current year earnings, tax law changes, and tax benefits for equity compensation. For the three months ended September 30, 2018, our effective tax rate differed from the federal statutory rate primarily due to state income tax expense on current year earnings while for the nine months ended September 30, 2018 it also differed because of tax benefits due to Internal Revenue Service acceptance in 2018 of an accounting method change applicable to the 2017 tax year, energy credits, and tax law changes. At September 30, 2019 and December 31, 2018, we had deferred tax assets, net of deferred tax liabilities and valuation allowance, of $191.8 million and $275.6 million, respectively. The accounting for deferred taxes is based upon estimates of future results. Differences between estimated and actual results could result in changes in the valuation of deferred tax assets that could have a material impact on our consolidated results of operations or financial position. Changes in existing tax laws could also affect actual tax results and the realization of deferred tax assets over time. Unrecognized tax benefits represent the difference between tax positions taken or expected to be taken in a tax return and the benefits recognized for financial statement purposes. We had $22.4 million and $30.6 million of gross unrecognized tax benefits at September 30, 2019 and December 31, 2018, respectively. Additionally, we had accrued interest and penalties of $6.2 million and $5.8 million at September 30, 2019 and December 31, 2018, respectively. It is reasonably possible within the next twelve months that our gross unrecognized tax benefits may decrease by up to $8.4 million, excluding interest and penalties, primarily due to potential audit settlements.

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- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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