Income Taxes	3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Tax Disclosure	INCOME TAXES We evaluate and update our estimated annual effective income tax rate on a quarterly basis based on current and forecasted operating results and tax laws. Consequently, based upon the mix and timing of our actual annual earnings compared to annual projections, our effective tax rate may vary quarterly and may make quarterly comparisons not meaningful. The quarterly income tax provision is generally comprised of tax expense on income or benefit on loss at the most recent estimated annual effective income tax rate, adjusted for the effect of discrete items. The effective income tax rate for the three months ended March 31, 2018 was a 25.8 percent benefit on loss compared to a 36.3 percent expense on income for the three months ended March 31, 2017. The effective income tax rate for the three months ended March 31, 2018, is based upon a full year forecasted tax expense on income. The effective income tax rate for the three months ended March 31, 2018 includes discrete income tax benefits of $0.2 million relating to the excess tax benefit recognized with the vesting of stock awards during the three months ended March 31, 2018, which resulted in a 1.2 percent increase to our effective tax rate. The federal corporate statutory income tax rate decreased from 35 percent in 2017 to 21 percent in 2018 resulting from the 2017 Tax Cuts and Jobs Act (the "2017 Tax Act"). The effective income tax rate for the three months ended March 31, 2018 is based upon a full year forecasted tax expense on income and is greater than the statutory federal tax rate, primarily due to state taxes, nondeductible officers’ compensation, and nondeductible lobbying expenses, partially offset by stock-based compensation tax deductions. We anticipate the potential for increased periodic volatility in future effective tax rates from the impact of stock-based compensation tax deductions as they are treated as discrete tax items. The effective tax rate for the three months ended March 31, 2017 is based upon a full year forecasted tax expense on income and is greater than the statutory federal tax rate, primarily due to state taxes, nondeductible officers’ compensation and nondeductible lobbying expenses, partially offset by stock-based compensation tax deductions. As of March 31, 2018, there is no liability for unrecognized income tax benefits. As of the date of this report, we are current with our income tax filings in all applicable state jurisdictions and are not currently under any state income tax examinations. We continue to voluntarily participate in the Internal Revenue Service's ("IRS") Compliance Assurance Program for the 2017 and 2018 tax years. We have received final acceptance of our 2016 federal income tax return from the IRS; however, this return is going through the Joint Tax Committee review process due to tax refunds requested.

INCOME TAXES

We evaluate and update our estimated annual effective income tax rate on a quarterly basis based on current and forecasted operating results and tax laws. Consequently, based upon the mix and timing of our actual annual earnings compared to annual projections, our effective tax rate may vary quarterly and may make quarterly comparisons not meaningful. The quarterly income tax provision is generally comprised of tax expense on income or benefit on loss at the most recent estimated annual effective income tax rate, adjusted for the effect of discrete items.

The effective income tax rate for the three months ended March 31, 2018 was a 25.8 percent benefit on loss compared to a 36.3 percent expense on income for the three months ended March 31, 2017. The effective income tax rate for the three months ended March 31, 2018, is based upon a full year forecasted tax expense on income. The effective income tax rate for the three months ended March 31, 2018 includes discrete income tax benefits of $0.2 million relating to the excess tax benefit recognized with the vesting of stock awards during the three months ended March 31, 2018, which resulted in a 1.2 percent increase to our effective tax rate. The federal corporate statutory income tax rate decreased from 35 percent in 2017 to 21 percent in 2018 resulting from the 2017 Tax Cuts and Jobs Act (the "2017 Tax Act").

The effective income tax rate for the three months ended March 31, 2018 is based upon a full year forecasted tax expense on income and is greater than the statutory federal tax rate, primarily due to state taxes, nondeductible officers’ compensation, and nondeductible lobbying expenses, partially offset by stock-based compensation tax deductions. We anticipate the potential for increased periodic volatility in future effective tax rates from the impact of stock-based compensation tax deductions as they are treated as discrete tax items. The effective tax rate for the three months ended March 31, 2017 is based upon a full year forecasted tax expense on income and is greater than the statutory federal tax rate, primarily due to state taxes, nondeductible officers’ compensation and nondeductible lobbying expenses, partially offset by stock-based compensation tax deductions.

As of March 31, 2018, there is no liability for unrecognized income tax benefits. As of the date of this report, we are current with our income tax filings in all applicable state jurisdictions and are not currently under any state income tax examinations. We continue to voluntarily participate in the Internal Revenue Service's ("IRS") Compliance Assurance Program for the 2017 and 2018 tax years. We have received final acceptance of our 2016 federal income tax return from the IRS; however, this return is going through the Joint Tax Committee review process due to tax refunds requested.