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Commitments and Contingencies Restructuring and Related Activities (Tables)
6 Months Ended
Jun. 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 six months ended June 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
 
198

 
534

 
732

Payments
 
(52
)
 
(434
)
 
(486
)
Balance at June 30, 2016
 
$
146

 
$
181

 
$
327

Balance at December 31, 2016
 
$
188

 
$
13

 
$
201

Charges
 
218

 
690

 
908

Payments
 
(316
)
 
(621
)
 
(937
)
Balance at June 30, 2017
 
$
90

 
$
82

 
$
172