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Segment Information - Schedule of Information of Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,866,131 | $ 1,562,662 | $ 1,436,849
Income before income taxes | $ 34,678 | $ 32,930 | $ 33,078 | $ 32,279 | $ 30,529 | $ 30,571 | $ 29,683 | $ 29,604 | 132,965 | 120,387 | 89,764
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,886 | 7,496 | 7,660
Total assets | 676,003 |  |  |  | 528,446 |  |  |  | 676,003 | 528,446 | 480,949
Capital expenditures |  |  |  |  |  |  |  |  | 5,397 | 5,442 | 4,998
Customer Concentration Risk | Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 327,500 |  |
Operating Segments | Housekeeping services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 979,610 | 957,148 | 909,709
Income before income taxes |  |  |  |  |  |  |  |  | 95,505 | 90,756 | 84,471
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,547 | 6,535 | 6,488
Total assets | 304,303 |  |  |  | 266,464 |  |  |  | 304,303 | 266,464 | 228,116
Capital expenditures |  |  |  |  |  |  |  |  | 4,287 | 4,612 | 3,586
Operating Segments | Dietary services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 886,521 | 605,514 | 527,140
Income before income taxes |  |  |  |  |  |  |  |  | 46,008 | 34,641 | 31,612
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,813 | 439 | 685
Total assets | 242,874 |  |  |  | 127,187 |  |  |  | 242,874 | 127,187 | 104,797
Capital expenditures |  |  |  |  |  |  |  |  | 663 | 410 | 336
Corporate and eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | (8,548) | (5,010) | (26,319)
Depreciation and amortization |  |  |  |  |  |  |  |  | 526 | 522 | 487
Total assets | $ 128,826 |  |  |  | $ 134,795 |  |  |  | 128,826 | 134,795 | 148,036
Capital expenditures |  |  |  |  |  |  |  |  | $ 447 | $ 420 | $ 1,076

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