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Income Taxes | 6 Months Ended
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Jun. 30, 2017
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes A reconciliation of the U.S. federal statutory tax rate to the Company’s effective income tax rate is as follows:
| Three months ended June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
U.S. federal statutory tax rate | (35.0 | )% |  | (35.0 | )% |  | (35.0 | )% |  | (35.0 | )%
State income taxes, net of federal benefit | (4.8 | ) |  | (4.8 | ) |  | (3.8 | ) |  | (4.7 | )
Non-U.S. income taxed at different rates | (0.1 | ) |  | (40.8 | ) |  | 0.1 |  |  | (37.2 | )
Excess tax benefit related to stock-based awards | 13.4 |  |  | — |  |  | 10.7 |  |  | — |
Other | (1.8 | ) |  | 2.8 |  |  | (1.0 | ) |  | 2.5 |
Effective income tax rate | (28.3 | )% |  | (77.8 | )% |  | (29.0 | )% |  | (74.4 | )%
Fluctuations in effective tax rates have historically been impacted by permanent tax differences with no associated income tax impact, changes in state apportionment factors, including the effect on state deferred tax assets and liabilities, and non-U.S. income taxed at different rates. Changes in the effective tax rate during the three and six months ended June 30, 2017, included the Company implementing ASU No. 2016-09 which requires accounting for excess tax benefits and tax deficiencies as discrete items in the period in which they occur. In January 2017, the Internal Revenue Service notified the Company that it will examine the Company’s federal tax returns for the year ended December 31, 2014. No adjustments have been asserted, and management believes that sustained adjustments, if any, would not have a material effect on the Company’s financial position, results of operations, or liquidity.

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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 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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