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Commitments and Contingencies Restructuring and Related Activities (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017 and 2016 were as follows (in thousands):    
 
 
United States
mechanical
construction
and facilities
services segment
 
United States building services segment
 
Total
Balance at December 31, 2015
 
$
—

 
$
81

 
$
81

Charges
 
401

 
870

 
1,271

Payments
 
(108
)
 
(770
)
 
(878
)
Balance at September 30, 2016
 
$
293

 
$
181

 
$
474

Balance at December 31, 2016
 
$
188

 
$
13

 
$
201

Charges
 
181

 
773

 
954

Payments
 
(369
)
 
(737
)
 
(1,106
)
Balance at September 30, 2017
 
$
—

 
$
49

 
$
49