Income Taxes	3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate for the three months ended March 31, 2019 and 2018 benefited from $2.4 million and $0.7 million, respectively, of excess tax benefits associated with stock-based compensation arrangements. U.S. GAAP prescribes a recognition threshold and measurement attribute for the accounting and financial statement disclosure of tax positions taken or expected to be taken in a tax return. The evaluation of a tax position is a two-step process. The first step requires the Company to determine whether it is more likely than not that a tax position will be sustained upon examination based on the technical merits of the position. The second step requires the Company to recognize in the financial statements each tax position that meets the more likely than not criteria, measured at the amount of benefit that has a greater than 50% likelihood of being realized. The Company’s unrecognized tax benefits would affect the tax rate, if recognized. The Company includes the full amount of unrecognized tax benefits in other noncurrent liabilities in the Company's Consolidated Balance Sheets. The Company anticipates it is reasonably possible an increase or decrease in the amount of unrecognized tax benefits could be made in the next twelve months. However, the Company does not presently anticipate that any increase or decrease in unrecognized tax benefits will be material to the consolidated financial statements. The amount recognized as of March 31, 2019 was $4.5 million.

Income Taxes

The effective tax rate for the three months ended March 31, 2019 and 2018 benefited from $2.4 million and $0.7 million, respectively, of excess tax benefits associated with stock-based compensation arrangements.

U.S. GAAP prescribes a recognition threshold and measurement attribute for the accounting and financial statement disclosure of tax positions taken or expected to be taken in a tax return. The evaluation of a tax position is a two-step process. The first step requires the Company to determine whether it is more likely than not that a tax position will be sustained upon examination based on the technical merits of the position. The second step requires the Company to recognize in the financial statements each tax position that meets the more likely than not criteria, measured at the amount of benefit that has a greater than 50% likelihood of being realized. The Company’s unrecognized tax benefits would affect the tax rate, if recognized. The Company includes the full amount of unrecognized tax benefits in other noncurrent liabilities in the Company's Consolidated Balance Sheets. The Company anticipates it is reasonably possible an increase or decrease in the amount of unrecognized tax benefits could be made in the next twelve months. However, the Company does not presently anticipate that any increase or decrease in unrecognized tax benefits will be material to the consolidated financial statements. The amount recognized as of March 31, 2019 was $4.5 million.