Receivables, net

Receivables, net at September 30, 2015, December 31, 2014 and September 30, 2014 are as follows:



(in thousands)	September 30, 2015		December 31, 2014		September 30, 2014
Construction contracts:
Completed and in progress	$	300,188	$	191,094	$	274,203
Retentions	82,344		84,760		79,475
Total construction contracts	382,532		275,854		353,678
Construction Material sales	68,449		28,549		54,718
Other	5,979		6,822		9,740
Total gross receivables	456,960		311,225		418,136
Less: allowance for doubtful accounts	272		291		508
Total net receivables	$	456,688	$	310,934	$	417,628

Receivables include amounts billed and billable to clients for services provided as of the end of the applicable period and do not bear interest. To the extent costs have not been billed or are not contractually billable, such as claim recovery estimates, the contract balance is included in costs and estimated earnings in excess of billings on the condensed consolidated balance sheets. Included in other receivables at September 30, 2015, December 31, 2014 and September 30, 2014 were items such as notes receivable, fuel tax refunds and income tax refunds. No such receivables individually exceeded 10% of total net receivables at any of these dates.

Financing receivables consisted of retentions receivable and were included in receivables, net on the condensed consolidated balance sheets as of September 30, 2015, December 31, 2014 and September 30, 2014. Certain construction contracts include retainage provisions. The balances billed but not paid by customers pursuant to these provisions generally become due upon completion and acceptance of the project work or products by the owners. No retention receivable individually exceeded 10% of total net receivables at any of the presented dates. As of September 30, 2015, the majority of the retentions receivable are expected to be collected within one year.

We segregate our retention receivables into two categories: escrow and non-escrow. The balances in each category were as follows:



(in thousands)	September 30, 2015		December 31, 2014		September 30, 2014
Escrow	$	21,590	$	28,692	$	26,128
Non-escrow	60,754		56,068		53,347
Total retention receivables	$	82,344	$	84,760	$	79,475

The escrow receivables include amounts due to Granite which have been deposited into an escrow account and bear interest. Typically, escrow retention receivables are held until work on a project is complete and has been accepted by the owner who then releases those funds, along with accrued interest, to us. There is minimal risk of not collecting on these amounts.

As of September 30, 2015, the non-escrow retention receivables aged over 90 days decreased to $0.1 million from $8.6 million at December 31, 2014. As of both dates, our allowance for doubtful accounts contained no material provision related to non-escrow retention receivables as we determined there were no significant collectability issues.