During the three months ended March 31, 2019 and 2018, we recognized revenue of $96.8 million and $89.3 million, respectively, that was included in the contract liability balances at December 31, 2018 and January 1, 2018.

During the three months ended March 31, 2019 and 2018, we recognized revenue of $41.3 million and $27.7 million, respectively, as a result of changes in contract transaction price related to performance obligations that were satisfied or partially satisfied prior to the end of the periods. The changes in contract transaction price were from items such as executed or estimated change orders and unresolved contract modifications and claims.

As of March 31, 2019 and 2018, the aggregate claim recovery estimates included in contract asset and liability balances were approximately $42.6 million and $34.0 million, respectively.

The components of the contract asset balances as of the respective dates were as follows (in thousands):

	March 31, 2019		December 31, 2018		March 31, 2018
Costs in excess of billings and estimated earnings	$	171,083	$	120,223	$	98,115
Contract retention		89,167		99,531		80,548
Total contract assets	$	260,250	$	219,754	$	178,663

As of March 31, 2019, December 31, 2018 and March 31, 2018, no individual contract retention balance exceeded 10% of total contract assets at any of the presented dates. The majority of the contract retention balance is expected to be collected within one year and there were no balances determined to be uncollectible.

The components of the contract liability balances as of the respective dates were as follows (in thousands):

	March 31, 2019		December 31, 2018		March 31, 2018
Billings in excess of costs and estimated earnings, net of retention	$	88,595	$	103,250	$	70,398
Provisions for losses		2,157		2,199		632
Total contract liabilities	$	90,752	$	105,449	$	71,030