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Income Taxes | 6 Months Ended
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Jun. 30, 2016
Income Tax Disclosure [Abstract] |
Income Taxes | 9. INCOME TAXES The determination of the annual effective tax is based upon a number of significant estimates and judgments, including the estimated annual pretax income in each tax jurisdiction in which we operate and the ongoing development of tax planning strategies during the year. In addition, our provision for income taxes can be impacted by changes in tax rates or laws, the finalization of tax audits and reviews, as well as other factors that cannot be predicted with certainty. As such, there can be significant volatility in interim tax provisions. The following is a summary of our provision for (benefit from) income taxes and effective tax rate from continuing operations:
|  | For the Quarter Ended June 30, |  |  | For the Year to Date Ended June 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Pretax income (loss) |  | $ | 17,244 |  |  | $ | (20,750 | ) |  | $ | 24,469 |  |  | $ | (45,490 | )
Provision for (benefit from) income taxes |  | $ | 4,620 |  |  | $ | (747 | ) |  | $ | 8,755 |  |  | $ | (958 | )
Effective rate |  |  | 26.8 | % |  |  | -3.6 | % |  |  | 35.8 | % |  |  | -2.1 | %
As of December 31, 2015, we determined that it was more likely than not that we will realize most of our deferred tax assets and, as a result, reversed a significant portion of our valuation allowance during the fourth quarter of 2015. As of December 31, 2015, a valuation allowance of $47.5 million was maintained with respect to our foreign tax credits, separate state net operating losses and Illinois edge credits. After considering both positive and negative evidence related to the realization of these deferred tax assets we have determined that it is necessary to continue to record the valuation allowance against these credits and separate state net operating losses as of June 30, 2016. The effective tax rate for the quarter and year to date ended June 30, 2016 includes a $2.1 million favorable tax adjustment related to the recent closure of a federal tax audit for the tax years 2013 and 2014. The effect of this discrete item was to decrease the quarter and year to date effective rate by 12.2% and 8.6%, respectively. The effective rate for the quarter and year to date ended June 30, 2015, was primarily driven by maintaining a full valuation allowance against our deferred tax assets. For the quarter and year to date ended June 30, 2015, the effect of federal and state valuation losses reduced the effective tax rate benefit by 28.0% and 37.1%, respectively. We estimate that it is reasonably possible that the gross liability for unrecognized tax benefits for a variety of uncertain tax positions will decrease by up to $1.3 million in the next twelve months as a result of the completion of various tax audits currently in process and the expiration of the statute of limitations in several jurisdictions. The income tax rate for the quarter and year to date ended June 30, 2016 does not take into account the possible reduction of the liability for unrecognized tax benefits. The impact of a reduction to the liability will be treated as a discrete item in the period the reduction occurs. We recognize interest and penalties related to unrecognized tax benefits in tax expense. As of June 30, 2016, we had accrued $1.8 million as an estimate for reasonably possible interest and accrued penalties. Our tax returns are routinely examined by federal, state, local and foreign tax authorities and these audits are at various stages of completion at any given time. The Internal Revenue Service recently completed its examination of our U.S. income tax returns for the 2013 and 2014 tax years.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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