Accounts Receivable

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Accounts Receivable

ACCOUNTS RECEIVABLE

Accounts receivable at December 31 consisted of the following (in thousands):

	2016			2015
Trade accounts receivable	$	81,193		$	102,277
Contract receivables:
Amounts billed	41,569			53,830
Costs in excess of billings	6,582			13,730
Total contract receivables	48,151			67,560
Total accounts receivables	129,344			169,837
Less allowance for doubtful accounts	(5,272		)	(4,868		)
Accounts receivable	$	124,072		$	164,969

Contract receivables are primarily associated with developers, contractors and customers in connection with the Renewable Energy and Conservation segment. Costs in excess of billings principally represent revenues recognized on contracts that were not billable as of the balance sheet date. These amounts will be billed in accordance with contract terms, generally as certain milestones are reached or upon shipment. All of the costs in excess of billings are expected to be collected within one year. In situations where billings exceed revenues recognized, the excess is included in billings in excess of cost in the consolidated balance sheet.