Financial Statement Information Finite-Lived Intangible Assets Acquired as Part of Business Combination (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2018

Dec. 31, 2017

Acquired Finite-Lived Intangible Assets [Line Items]

Schedule of Goodwill [Table Text Block]

Intangible assets consist primarily of goodwill (the cost of purchased businesses in excess of the fair value of the identifiable net assets acquired) and other specifically identifiable intangible assets, such as trade names, trademarks, customer and supplier relationships, software and other technology related assets, and covenants not to compete.

The changes in the carrying amount of goodwill by reportable segment for the six months ended June 30, 2018 are as follows (in thousands):

	North America			Europe			Specialty			Total
Balance as of January 1, 2018	$	1,709,354		$	1,414,898		$	412,259		$	3,536,511
Business acquisitions and adjustments to previously recorded goodwill	714			934,844			(5,667		)	929,891
Exchange rate effects	(5,078		)	(39,536		)	188			(44,426		)
Balance as of June 30, 2018	$	1,704,990		$	2,310,206		$	406,780		$	4,421,976

During the six months ended June 30, 2018, we recorded $931 million of goodwill related to our acquisition of Stahlgruber. See Note 2, "Business Combinations" for further information on our acquisitions.

Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]

The components of intangible assets acquired as part of our acquisition of Stahlgruber in May 2018 are as follows (in thousands):

	Gross Amount
Trade names and trademarks	$	173,382
Customer and supplier relationships	78,239
Software and other technology related assets	28,778
	$	280,399

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

13 years 10 months 24 days

16 years 6 months

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life [Table Text Block]

The weighted-average amortization periods for our intangible assets acquired during the six months ended June 30, 2018 and the year ended December 31, 2017 are as follows (in years):

	Six Months Ended	Year Ended
	June 30, 2018	December 31, 2017
	Stahlgruber	All Acquisitions
Trade names and trademarks	19.9	11.2
Customer and supplier relationships	3.0	18.6
Software and other technology related assets	7.4	11.1
Covenants not to compete	-	4.4
Total intangible assets	13.9	16.5