Contract Assets And Contract Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of contract assets and contract liabilities [abstract]

Schedule Of Contract Assets And Contract Liabilities

At December 31,	2018		2017		$ change
Contract assets	$	6,223	$	7,223	$	(1,000)
Less: non-current portion		(1,689)		(645)		(1,044)
Current portion		4,534		6,578		(2,044)
Contract liabilities		16,001		14,044		1,957
Less: non-current portion		(1,420)		(2,223)		803
Current portion		14,581		11,821		2,760

Schedule Of Performance Obligations

At December 31,	2018		2017
OnSite Generation	$	20,600	$	19,900
Power Systems		112,100		124,700
Total	$	132,700	$	144,600