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Acquisitions Acquisitions	3 Months Ended
Acquisitions Acquisitions	Mar. 31, 2018
Business Combinations [Abstract]
Acquisitions	Acquisitions As more fully discussed in Note 11 of the Company's notes to the consolidated financial statements in its 2017 Annual Report on Form 10-K, the estimated fair values of the assets acquired and liabilities assumed as part of the AAG acquisition in November 2017 are preliminary and subject to revision. For the three months ended March 31, 2018, no significant changes were made to the provisional amounts disclosed for the year ended December 31, 2017.