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Commitments and Contingencies Restructuring and Related Activities (Tables)
9 Months Ended
Sep. 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 nine months ended September 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

 
842

 
742

Payments
(149
)
 
(32
)
 
(384
)
 
(565
)
Balance at September 30, 2015
$

 
$

 
$
458

 
$
458

Balance at December 31, 2015
$

 
$

 
$
81

 
$
81

Charges

 
401

 
870

 
1,271

Payments

 
(108
)
 
(770
)
 
(878
)
Balance at September 30, 2016
$

 
$
293

 
$
181

 
$
474