Goodwill and Identifiable Intangible Assets, Net (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Identifiable Intangible Assets, Net

Schedule of changes in the carrying amount of goodwill

The changes in the carrying amount of goodwill are as follows (in thousands):

	December 31,
	2018		2017
Balance at beginning of year	$	200,584	$	149,208
Additions (See Note 4)		34,598		52,481
Impairment adjustment		—		(1,105)
Balance at end of year	$	235,182	$	200,584

Schedule of components of identifiable intangible assets

Identifiable intangible assets consist of the following (dollars in thousands):

		December 31,
	Estimated	2018				2017
	Useful Lives	Gross Book		Accumulated		Gross Book		Accumulated
	in Years	Value		Amortization		Value		Amortization
Customer relationships	1 - 15	$	128,480	$	(60,731)	$	98,244	$	(47,057)
Backlog	1 - 2		9,100		(8,260)		6,300		(5,478)
Tradenames	2 - 25		39,395		(12,709)		35,340		(11,305)
Total		$	176,975	$	(81,700)	$	139,884	$	(63,840)

Schedule of future amortization expense of identifiable intangible assets

At December 31, 2018, future amortization expense of identifiable intangible assets is as follows (in thousands):

Year ended December 31—
2019	$	18,088
2020		15,103
2021		12,060
2022		9,866
2023		8,478
Thereafter		31,680
Total	$	95,275