Receivables, net

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



(in thousands)	June 30, 2015		December 31, 2014		June 30, 2014
Construction contracts:
Completed and in progress	$	229,861	$	191,094	$	237,870
Retentions	77,955		84,760		69,678
Total construction contracts	307,816		275,854		307,548
Construction Material sales	49,064		28,549		48,932
Other	5,820		6,822		7,677
Total gross receivables	362,700		311,225		364,157
Less: allowance for doubtful accounts	364		291		543
Total net receivables	$	362,336	$	310,934	$	363,614

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 billable, 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 June 30, 2015, December 31, 2014 and June 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 June 30, 2015, December 31, 2014 and June 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 June 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)	June 30, 2015		December 31, 2014		June 30, 2014
Escrow	$	22,381	$	28,692	$	25,093
Non-escrow	55,574		56,068		44,585
Total retention receivables	$	77,955	$	84,760	$	69,678

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 June 30, 2015, the non-escrow retention receivables aged over 90 days decreased to $6.3 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.