Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill [Table Text Block]

Goodwill and intangible assets consisted of the following at December 31:

	2016								2015
(in thousands)	Gross Carrying Amount			Accumulated Amortization		Net Carrying Amount			Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Goodwill
T&D	$	40,224		$	—	$	40,224		$	40,567	$	—	$	40,567
C&I		6,557			—		6,557			6,557		—		6,557
Total goodwill	$	46,781		$	—	$	46,781		$	47,124	$	—	$	47,124
Amortizable Intangible Assets
Backlog	$	989		$	989	$	—		$	765	$	695	$	70
Customer relationships		5,266			3,590		1,676			5,144		3,103		2,041
Trade names		695			79		616			695		—		695
Unallocated intangible assets		747			26		721			—		—		—
Foreign currency translation		(3	)		—		(3	)		—		—		—
Indefinite-lived Intangible Assets
Trade names		8,556			—		8,556			8,556		—		8,556
Total Intangible assets	$	16,250		$	4,684	$	11,566		$	15,160	$	3,798	$	11,362