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Segment Information - Schedule of Information of Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 496,408 | $ 506,871 | $ 503,732 | $ 501,810 | $ 499,410 | $ 491,355 | $ 470,876 | $ 404,490 | $ 2,008,821 | $ 1,866,131 | $ 1,562,662
Income before income taxes | 35,007 | $ 32,982 | $ 33,316 | $ (1,395) | 34,678 | $ 32,930 | $ 33,078 | $ 32,279 | 99,910 | 132,965 | 120,387
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,272 | 8,886 | 7,496
Total assets | 692,603 |  |  |  | 676,003 |  |  |  | 692,603 | 676,003 | 528,446
Capital expenditures |  |  |  |  |  |  |  |  | 4,940 | 5,397 | 5,442
Customer Concentration Risk | Revenue from Contract with Customer | Genesis |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 386,700 | $ 327,500 |
Concentration risk, percentage |  |  |  |  |  |  |  |  | 19.30% | 17.50% |
Housekeeping services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 973,800 | $ 979,600 | 957,100
Dietary services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,035,000 | 886,500 | 605,500
Operating Segments | Housekeeping services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 973,826 | 979,610 | 957,148
Income before income taxes |  |  |  |  |  |  |  |  | 108,305 | 95,505 | 90,756
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,315 | 6,547 | 6,535
Total assets | 291,117 |  |  |  | 304,303 |  |  |  | 291,117 | 304,303 | 266,464
Capital expenditures |  |  |  |  |  |  |  |  | 3,996 | 4,287 | 4,612
Operating Segments | Dietary services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,034,995 | 886,521 | 605,514
Income before income taxes |  |  |  |  |  |  |  |  | 60,562 | 46,008 | 34,641
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,433 | 1,813 | 439
Total assets | 235,183 |  |  |  | 242,874 |  |  |  | 235,183 | 242,874 | 127,187
Capital expenditures |  |  |  |  |  |  |  |  | 690 | 663 | 410
Corporate and eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | (68,957) | (8,548) | (5,010)
Depreciation and amortization |  |  |  |  |  |  |  |  | 524 | 526 | 522
Total assets | $ 166,303 |  |  |  | $ 128,826 |  |  |  | 166,303 | 128,826 | 134,795
Capital expenditures |  |  |  |  |  |  |  |  | $ 254 | $ 447 | $ 420

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