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Commitments and Contingencies Restructuring and Related Activities (Tables)
6 Months Ended
Jun. 30, 2016
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]
The changes in restructuring activity by reportable segments during the six months ended June 30, 2016 and 2015 were as follows (in thousands):    
 
United States
electrical
construction
and facilities
services segment
 
United States
mechanical
construction
and facilities
services segment
 
United States building services segment
 
Total
Balance at December 31, 2014
$
255

 
$
26

 
$

 
$
281

Charges
(106
)
 
6

 
541

 
441

Payments
(149
)
 
(32
)
 

 
(181
)
Balance at June 30, 2015
$

 
$

 
$
541

 
$
541

Balance at December 31, 2015
$

 
$

 
$
81

 
$
81

Charges

 
198

 
534

 
732

Payments

 
(52
)
 
(434
)
 
(486
)
Balance at June 30, 2016
$

 
$
146

 
$
181

 
$
327