Receivables, net



(in thousands)	March 31, 2016		December 31, 2015		March 31, 2015
Construction contracts:
Completed and in progress	$	178,974	$	206,756	$	163,671
Retentions	93,495		91,670		74,718
Total construction contracts	272,469		298,426		238,389
Construction Material sales	23,392		28,727		26,776
Other	11,940		14,033		6,504
Total gross receivables	307,801		341,186		271,669
Less: allowance for doubtful accounts	318		364		341
Total net receivables	$	307,483	$	340,822	$	271,328

Receivables include amounts billed and billable to clients for services provided as of the end of the applicable period and, except for escrow receivables, 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, billings in excess of costs and estimated earnings or in equity in construction joint ventures on the condensed consolidated balance sheets. As of March 31, 2016, December 31, 2015 and March 31, 2015, claim recovery estimates were included in these balances and combined were approximately $56.1 million, $48.5 million and $9.7 million, respectively. Ultimate settlement with the customer is dependent on the claims resolution process and could extend beyond one year or the project operating cycle. Included in other receivables at March 31, 2016, December 31, 2015 and March 31, 2015 were items such as back charges, notes receivable, fuel tax refunds, receivables from vendors and income tax refunds. No such receivables individually exceeded 10% of total net receivables at any of these dates.

Certain construction contracts include retainage provisions and the associated retention receivables are considered financing receivables. 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, 2016, 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, 2016		December 31, 2015		March 31, 2015
Escrow	$	21,015	$	21,958	$	22,421
Non-escrow	72,480		69,712		52,297
Total retention receivables	$	93,495	$	91,670	$	74,718

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 all periods presented, our allowance for doubtful accounts contained no material provision related to non-escrow retention receivables as we determined there were no significant collectability issues.