Segment Disclosures | Note 16. Segment Disclosures Our business units have been aggregated into three practice groups: Financial Services, Benefits and Insurance Services and National Practices. The business units have been aggregated based on the following factors: similarity of the products and services provided to clients; similarity of the regulatory environment in which they operate; and similarity of economic conditions affecting long-term performance. The business units are managed along these segment lines. A general description of services provided by each practice group is provided in the table below. Financial Services Benefits and Insurance Services National Practices • Accounting and Tax • Government Healthcare Consulting • Financial Advisory • Valuation • Risk & Advisory Services • Group Health Benefits Consulting • Payroll • Property & Casualty • Retirement Plan Services • Managed Networking and Hardware Services • Healthcare Consulting Corporate and Other . Included in “Corporate and Other” are operating expenses that are not directly allocated to the individual business units. These expenses are primarily comprised of certain health care costs, gains or losses attributable to assets held in our non-qualified deferred compensation plan, share-based compensation, consolidation and integration charges, certain professional fees, certain advertising costs and other various expenses. Accounting policies of the practice groups are the same as those described in Note 1, Basis of Presentation and Significant Accounting Policies, to the Annual Report on Form 10-K for the year ended December 31, 2018. Upon consolidation, intercompany accounts and transactions are eliminated, thus inter-segment revenue is not included in the measure of profit or loss for the practice groups. Performance of the practice groups is evaluated on operating income excluding those costs listed above, which are reported in the “Corporate and Other” segment. Segment information for the three and six months ended June 30, 2019 and 2018 is presented below. We do not manage our assets on a segment basis, therefore segment assets are not presented below. Three Months Ended June 30, 2019 Financial Services Benefits and Insurance Services National Practices Corporate and Other Total Revenue $ 154,373 $ 72,127 $ 8,998 $ — $ 235,498 Operating expenses 128,158 61,075 8,204 711 198,148 Gross margin 26,215 11,052 794 (711 ) 37,350 Corporate general & admin — — — 10,566 10,566 Operating income (loss) 26,215 11,052 794 (11,277 ) 26,784 Other (expense) income: Interest expense — (14 ) — (1,573 ) (1,587 ) Gain on sale of operations, net 50 — — — 50 Other (expense) income, net (66 ) 174 1 (3,420 ) (3,311 ) Total other (expense) income (16 ) 160 1 (4,993 ) (4,848 ) Income (loss) from continuing operations before income tax expense $ 26,199 $ 11,212 $ 795 $ (16,270 ) $ 21,936 Three Months Ended June 30, 2018 Financial Services Benefits and Insurance Services National Practices Corporate and Other Total Revenue $ 151,737 $ 72,753 $ 8,151 $ — $ 232,641 Operating expenses 129,070 61,165 7,567 7,300 205,102 Gross margin 22,667 11,588 584 (7,300 ) 27,539 Corporate general & admin — — — 9,993 9,993 Operating income (loss) 22,667 11,588 584 (17,293 ) 17,546 Other (expense) income: Interest expense — (15 ) — (1,802 ) (1,817 ) Other (expense) income, net (17 ) 30 — 617 630 Total other (expense) income (17 ) 15 — (1,185 ) (1,187 ) Income (loss) from continuing operations before income tax expense $ 22,650 $ 11,603 $ 584 $ (18,478 ) $ 16,359 Segment information for the six months ended June 30, 2019 and 2018 was as follows (in thousands): Six Months Ended June 30, 2019 Financial Services Benefits and Insurance Services National Practices Corporate and Other Total Revenue $ 339,517 $ 148,382 $ 17,597 $ — $ 505,496 Operating expenses 262,616 122,446 16,204 12,378 413,644 Gross margin 76,901 25,936 1,393 (12,378 ) 91,852 Corporate general & admin — — — 22,246 22,246 Operating income (loss) 76,901 25,936 1,393 (34,624 ) 69,606 Other income (expense): Interest expense — (24 ) — (2,964 ) (2,988 ) Gain on sale of operations, net 547 — — — 547 Other (expense) income, net (202 ) 195 1 5,955 5,949 Total other income 345 171 1 2,991 3,508 Income (loss) from continuing operations before income tax expense $ 77,246 $ 26,107 $ 1,394 $ (31,633 ) $ 73,114 Six Months Ended June 30, 2018 Financial Services Benefits and Insurance Services National Practices Corporate and Other Total Revenue $ 332,340 $ 150,083 $ 16,308 $ — $ 498,731 Operating expenses 262,103 122,298 14,842 10,609 409,852 Gross margin 70,237 27,785 1,466 (10,609 ) 88,879 Corporate general & admin — — — 20,021 20,021 Operating income (loss) 70,237 27,785 1,466 (30,630 ) 68,858 Other income (expense): Interest expense — (89 ) — (3,508 ) (3,597 ) Gain on sale of operations, net — — — 663 663 Other income (expense), net 248 222 — (1,069 ) (599 ) Total other income (expense) 248 133 — (3,914 ) (3,533 ) Income (loss) from continuing operations before income tax expense $ 70,485 $ 27,918 $ 1,466 $ (34,544 ) $ 65,325 |