Receivables, net

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



(in thousands)	March 31, 2015		December 31, 2014		March 31, 2014
Construction contracts:
Completed and in progress	$	163,671	$	191,094	$	142,289
Retentions	74,718		84,760		69,574
Total construction contracts	238,389		275,854		211,863
Construction Material sales	26,776		28,549		23,790
Other	6,504		6,822		12,212
Total gross receivables	271,669		311,225		247,865
Less: allowance for doubtful accounts	341		291		2,584
Total net receivables	$	271,328	$	310,934	$	245,281

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 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 March 31, 2015, December 31, 2014 and March 31, 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 March 31, 2015, December 31, 2014 and March 31, 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 March 31, 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)	March 31, 2015		December 31, 2014		March 31, 2014
Escrow	$	22,421	$	28,692	$	25,603
Non-escrow	52,297		56,068		43,971
Total retention receivables	$	74,718	$	84,760	$	69,574

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 March 31, 2015, the non-escrow retention receivables aged over 90 days decreased to $6.7 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.