Income Taxes	9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes: As of September 30, 2017, we had no unrecognized tax benefits. We are currently under examination for our U.S. federal income taxes under the Internal Revenue Service's Compliance Assurance Program for 2017, 2016 and 2015 and are subject to examination by numerous other taxing authorities in the U.S. and in jurisdictions such as Australia, Belgium, France, Canada, and Germany. We are generally no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by taxing authorities for years prior to 2011. Since January 1, 2017, numerous states and the District of Columbia have enacted legislation effective for tax years beginning on or after January 1, 2017, including changes to tax rates. The impact of these changes is immaterial. On March 30, 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which changes the accounting for certain aspects of share-based payments to employees. The new guidance requires entities to record all tax effects related to share-based payments at settlement or expiration through the income statement and the excess tax benefit to be recorded when it arises, subject to normal valuation allowance considerations. The new guidance also requires excess tax benefits to be classified along with other income tax cash flows as an operating activity in the statement of cash flows rather than, as previously required, a financing activity. We recognized discrete tax benefits of $1.5 million and $9.6 million in the income taxes line item of our Consolidated Statements of Operations for the three and nine months ended September 30, 2017, respectively, related to excess tax benefits upon vesting or settlement in those periods.

Income Taxes

9 Months Ended

Sep. 30, 2017

Income Taxes:

As of September 30, 2017, we had no unrecognized tax benefits.

We are currently under examination for our U.S. federal income taxes under the Internal Revenue Service's Compliance Assurance Program for 2017, 2016 and 2015 and are subject to examination by numerous other taxing authorities in the U.S. and in jurisdictions such as Australia, Belgium, France, Canada, and Germany. We are generally no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by taxing authorities for years prior to 2011.

Since January 1, 2017, numerous states and the District of Columbia have enacted legislation effective for tax years beginning on or after January 1, 2017, including changes to tax rates. The impact of these changes is immaterial.

On March 30, 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which changes the accounting for certain aspects of share-based payments to employees. The new guidance requires entities to record all tax effects related to share-based payments at settlement or expiration through the income statement and the excess tax benefit to be recorded when it arises, subject to normal valuation allowance considerations. The new guidance also requires excess tax benefits to be classified along with other income tax cash flows as an operating activity in the statement of cash flows rather than, as previously required, a financing activity. We recognized discrete tax benefits of $1.5 million and $9.6 million in the income taxes line item of our Consolidated Statements of Operations for the three and nine months ended September 30, 2017, respectively, related to excess tax benefits upon vesting or settlement in those periods.