Income Taxes Income Taxes (Notes)

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Tax Disclosure

2. Income Taxes

On December 22, 2017, the U.S. enacted significant changes to U.S. tax law following the passage and signing of “Tax Cuts and Jobs Act” or the “TCJA”. The TCJA is complex and significantly changes the U.S. corporate income tax system by, among other things, reducing the Federal corporate income tax rate from 35% to 21%. The lower effective tax rate for the three months ended March 31, 2018 and 2017 benefited from $0.7 million and $0.8 million, respectively, of excess tax benefits associated with stock-based compensation arrangements.