Revenue

Revenues are recognized when control of the promised goods or services is transferred to the customer in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. The following table represents a disaggregation of the Company’s contract revenue by service line for the marine and concrete segments:



	Three months ended June 30,				Six months ended June 30,
	2019		2018		2019		2018
Marine Segment
Construction	$	57,181	$	52,860	$	90,817	$	95,235
Dredging	27,191		23,472		53,358		40,483
Specialty Services	4,651		4,366		6,335		7,771
Marine segment contract revenues	$	89,023	$	80,698	$	150,510	$	143,489

Concrete Segment
Structural	$	12,665	$	62,189	$	24,156	$	118,682
Light Commercial	64,275		16,740		134,371		34,112
Other	22		140		53		327
Concrete segment contract revenues	$	76,962	$	79,069	$	158,580	$	153,121

Total contract revenues	$	165,985	$	159,767	$	309,090	$	296,610

Although the Company has disaggregated its contract revenues here in terms of services provided, it believes its operations comprise two reportable segments pursuant to FASB ASC Topic 280, Segment Reporting. In making this determination, the Company considered the similar characteristics of its operations as discussed in Note 1. Additionally, as discussed, both the marine and concrete segments have limited contracts with multiple performance obligations. The Company’s contracts often combine multiple services, such as engineering, dredging, diving and construction, into one distinct finished product which is transferred to the customer. These contracts are often estimated and bid as one project and evaluated on performance as one project, not by individual services performed by each. Both the marine and concrete segments have a single chief operating decision maker (“CODM”) for the entire segment, not by service lines of the segments. Resources are allocated by segment and financial and budgetary information is compiled and reviewed by segment, not service line.

Marine Segment

Construction services include construction, restoration, maintenance, dredging and repair of marine transportation facilities, marine pipelines, bridges and causeways and marine environmental structures. Dredging services generally enhance or preserve the navigability of waterways or the protection of shorelines through the removal or replenishment of soil, sand or rock. Specialty services include design, salvage, demolition, surveying, towing, diving and underwater inspection, excavation and repair.

Concrete Segment

Structural services include elevated concrete pouring for products such as columns, elevated beams and structural walls. Light commercial services include horizontally poured concrete for products such as sidewalks, ramps, tilt walls and trenches. Other services comprise labor related to concrete pouring such as rebar installation and pumping services and typically support the Company's structural and light commercial services.