Accounts Receivable

6 Months Ended

Jun. 30, 2017

Receivables [Abstract]

ACCOUNTS RECEIVABLE

ACCOUNTS RECEIVABLE, NET

Accounts receivable consists of the following (in thousands):

	June 30, 2017			December 31, 2016
Trade accounts receivable	$	101,578		$	81,193
Contract receivables:
Amounts billed	35,658			41,569
Costs in excess of billings	7,007			6,582
Total contract receivables	42,665			48,151
Total accounts receivable	144,243			129,344
Less allowance for doubtful accounts	(5,372		)	(5,272		)
Accounts receivable	$	138,871		$	124,072

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.