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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue Recognition [Abstract]  
Disaggregation of revenue [Table Text Block]
The following tables disaggregate our revenue for the year ended December 31, 2018 by major sources:
Year Ended December 31, 2018
 
Utility
 
Residential and Commercial
 
All Other
 
Consolidated
Type of service:
 
 
 
 
 
 
 
 
  Tree and plant care
 
$
394,481

 
$
290,940

 
$
(1,520
)
 
$
683,901

  Grounds maintenance
 
—

 
117,498

 
—

 
117,498

  Storm damage services
 
13,864

 
9,447

 
—

 
23,311

  Consulting and other
 
129,139

 
68,120

 
2,822

 
200,081

     Total revenues
 
$
537,484

 
$
486,005

 
$
1,302

 
$
1,024,791

 
 
 
 
 
 
 
 
 
Geography:
 
 
 
 
 
 
 
 
  United States
 
$
499,242

 
$
448,773

 
$
1,302

 
$
949,317

  Canada
 
38,242

 
37,232

 
—

 
75,474

     Total revenues
 
$
537,484

 
$
486,005

 
$
1,302

 
$
1,024,791
Contract with customer, asset and liability [Table Text Block]
Net contract liabilities consisted of the following:
 
December 31,
2018
 
December 31,
2017
Contract liabilities - current
$
2,907

 
$
2,072

Contract liabilities - noncurrent
2,287

 
2,020

     Net contract liabilities
$
5,194

 
$
4,092