Goodwill and Other Intangible Assets (Tables) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Sep. 30, 2017

Sep. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill Amounts by Reporting Unit

Goodwill amounts by reporting unit are summarized as follows: 

	Goodwill at		Acquisitions		Dispositions		Other (1)		Goodwill at
	December 31, 2016								September 30, 2017
United States	$	583,780	$	—	$	—	$	—	$	583,780
Canada	28,377		—		—		2,153		30,530
Mexico	3,525		—		—		475		4,000
Total	$	615,682	$	—	$	—	$	2,628	$	618,310

(1) These amounts relate to adjustments resulting from fluctuations in foreign currency exchange rates.

Components of Other Intangibles, Net

Other intangibles, net, as of September 30, 2017 and December 31, 2016 consist of the following: 

	Estimated Useful Life (Years)	September 30, 2017		December 31, 2016
Customer relationships	20	$	690,405	$	687,642
Trademarks - All Others	Indefinite	85,846		85,294
Trademarks - TagWorks	5	300		300
KeyWorks license	7	4,456		4,438
Patents	7-12	32,844		32,796
Intangible assets, gross		813,851		810,470
Less: Accumulated amortization		123,524		94,658
Other intangibles, net		$	690,327	$	715,812

Amortization

$ 9,500

$ 9,481

$ 28,442

$ 28,435