Accounts Receivable

12 Months Ended

Dec. 31, 2015

Receivables [Abstract]

Accounts Receivable

ACCOUNTS RECEIVABLE

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

	2015			2014
Trade accounts receivable	$	102,277		$	105,421
Contract receivables:
Amounts billed	53,830			—
Costs in excess of billings	13,730			—
Total contract receivables	67,560			—
Total accounts receivables	169,837			105,421
Less allowance for doubtful accounts	(4,868		)	(4,280		)
Accounts receivable	$	164,969		$	101,141

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.