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Income Taxes
9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes 

Income tax expense related to continuing operations for the three and nine months ended September 30, 2017 was $8.3 million and $25.8 million, respectively. Income tax expense related to continuing operations for the three and nine months ended
September 30, 2016 was $5.1 million and $14.9 million, respectively.

An income tax benefit from an uncertain tax position may be recognized when it is more likely than not that the position will be sustained upon examination, based on technical merits, including resolutions of any related appeals or litigation processes. The reserve for uncertain tax positions at September 30, 2017 was $4.9 million, including interest and penalties.  Within the next twelve months, it is reasonably possible that $0.3 million of unrecognized income tax benefits will be recognized upon settlement of tax examinations and the expiration of various statutes of limitations.