Intangible Assets and Goodwill (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	2019
	Amortization period (years)	Gross Amount		Accumulated Amortization		Net intangible assets
		(in thousands)
Customer relationships	15-20	$	23,000	$	3,221	$	19,779
Tradename	0.5-10	12,900		8,260		4,640
Covenants not to compete	1-10	5,300		2,583		2,717
		$	41,200	$	14,064	$	27,136

	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

Schedule of Goodwill [Table Text Block]

Changes in carrying amount of goodwill during the twelve months ended December 31, 2019 and December 31, 2018 were as follows:

	(in thousands)
Balance at December 31, 2017	$	132,410
Acquisition	—
Balance at December 31, 2018	$	132,410
Acquisition	35,885
Balance at December 31, 2019	$	168,295