Identified Intangible Assets and Goodwill, Net (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of acquired finite-lived intangible assets by major class [Table Text Block]

The carrying amount of the intangible assets and goodwill acquired in connection with our acquisitions were as follows:

	Weighted-Average Amortization Period (Years)		December 31, 2018				December 31, 2017
			Carrying Amount		Accumulated Amortization		Carrying Amount		Accumulated Amortization
Amortized intangible assets:
Customer lists/relationships	3.6	years	$	25,179	$	18,251	$	21,487	$	16,846
Employment-related	2.8	years	8,133		6,954		7,333		6,624
Tradenames	3.7	years	6,858		5,435		5,978		5,134
Total			40,170		$	30,640	34,798		$	28,604
Less accumulated amortization			30,640				28,604
Intangible assets, net			9,530				6,194
Goodwill			37,971				35,477
			$	47,501			$	41,671

Schedule of goodwill [Table Text Block]

The changes in the carrying amounts of goodwill, by segment, for the years ended December 31, 2018 and December 31, 2017 follow:

	Balance at January 1, 2018		Acquisitions		Translation and Other Adjustments			Balance at December 31, 2018
Utility	$	3,424	$	1,487	$	—		$	4,911
Residential and Commercial	32,053		1,353		(346		)	33,060
Total	$	35,477	$	2,840	$	(346	)	$	37,971

	Balance at January 1, 2017		Acquisitions		Translation and Other Adjustments		Balance at December 31, 2017
Utility	$	3,424	$	—	$	—	$	3,424
Residential and Commercial	26,881		5,131		41		32,053
Total	$	30,305	$	5,131	$	41	$	35,477

Schedule of finite-lived intangible assets, future amortization expense [Table Text Block]

The estimated aggregate amortization expense of intangible assets, as of December 31, 2018, in each of the next five years follows:

	Estimated Future Amortization Expense
Year ending December 31, 2019	$	2,197
2020	2,011
2021	1,569
2022	1,339
2023	1,209
Thereafter	1,205
	$	9,530