Intangible Assets and Goodwill

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Goodwill

Intangible Assets and Goodwill

The following tables summarize the intangible assets subject to amortization for the years ended December 31, 2018 and December 31, 2017.

	2018
	Amortization period (years)	Gross Amount		Accumulated Amortization		Net intangible assets
		(in thousands)
Customer relationships	20	13,600		2,329		$	11,271
Tradename	0.5-6	8,100		7,021		1,079
Covenants not to compete	1-10	4,200		2,056		2,144
		$	25,900	$	11,406	$	14,494

	2017
	Amortization period (years)	Gross Amount		Accumulated Amortization		Net intangible assets
		(in thousands)
Customer relationships	20	13,600		1,645		$	11,955
Tradename	0.5-6	8,100		5,769		2,331
Covenants not to compete	1-10	4,200		1,464		2,736
		$	25,900	$	8,878	$	17,022

Amortization expense for the twelve months ended December 31, 2018 and 2017 was $2.5 million and $2.9 million, respectively, and was included in depreciation and amortization in the consolidated statements of comprehensive income.

Future amortization expense for intangible assets is estimated at $2.3 million for 2019, $1.2 million for 2020, $1.2 million for 2021, and $1.1 million for 2022, and $1.0 million for 2023.

Changes in carrying amount of goodwill during the twelve months ended December 31, 2018 and December 31, 2017 were as follows:

	(in thousands)
Balance at December 31, 2016	$	100,212
Acquisition	32,198
Balance at December 31, 2017	$	132,410
Acquisition	—
Balance at December 31, 2018	$	132,410