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Commitments and Contingencies Restructuring and Related Activities (Tables)
3 Months Ended
Mar. 31, 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 three months ended March 31, 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
2

 
6

 

 
8

Payments
(18
)
 
(32
)
 

 
(50
)
Balance at March 31, 2015
$
239

 
$

 
$

 
$
239

Balance at December 31, 2015
$

 
$

 
$
81

 
$
81

Charges

 

 
91

 
91

Payments

 

 

 

Balance at March 31, 2016
$

 
$

 
$
172

 
$
172