Revenue

Our primary source of revenue is the sale of glass tableware products manufactured within a Libbey facility as well as globally sourced tabletop products, including glassware, ceramicware, metalware and others. For the three months ended March 31, 2019 and 2018, bad debt expense was immaterial. Additionally, adjustments related to revenue recognized in prior periods was not material for the three months ended March 31, 2019 and 2018. There were no material contract assets, contract liabilities or deferred contract costs recorded on the Condensed Consolidated Balance Sheets as of March 31, 2019 and December 31, 2018.

Disaggregation of Revenue:

The following table presents our net sales disaggregated by business channel:



	Three months ended March 31,
(dollars in thousands)	2019		2018
Foodservice	$	70,817	$	76,173
Retail	55,573		55,761
Business-to-business	48,576		49,979
Consolidated	$	174,966	$	181,913

Each operating segment has revenues across all our business channels. Each channel has a different marketing strategy, customer base and product composition. For both periods presented, over 75 percent of each segment's revenue is derived from the following business channels: U.S. and Canada from foodservice and retail; Latin America from retail and business-to-business; and EMEA from business-to-business and retail.