Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2018

Revenue Recognition [Abstract]

Disaggregation of revenue [Table Text Block]

The following table disaggregates our revenue for the three months ended March 31, 2018 by major sources:

	Utility		Residential and Commercial		All Other		Consolidated
Type of service:
Tree and plant care	$	86,316	$	56,397	$	15	$	142,728
Grounds maintenance	—		22,802		—		22,802
Storm damage services	3,214		899		—		4,113
Consulting and other	29,157		9,247		604		39,008
Total revenues	$	118,687	$	89,345	$	619	$	208,651
Geography:
United States	$	110,453	$	82,478	$	619	$	193,550
Canada	8,234		6,867		—		15,101
Total revenues	$	118,687	$	89,345	$	619	$	208,651

Contract with customer, asset and liability [Table Text Block]

Net contract liabilities consisted of the following:

	March 31, 2018		December 31, 2017
Contract liabilities - current	$	3,989	$	2,072
Contract liabilities - noncurrent	2,042		2,020
Net contract liabilities	$	6,031	$	4,092