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Goodwill and Other Intangible Assets, Net (Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Changes in the Company's goodwill balances |  |
Beginning balance | $ 778,951 | $ 615,433
Acquisitions (net of dispositions) | (2,549) | 163,473
Foreign currency translation | (43) | 45
Ending balance | 776,359 | 778,951
U.S. Corrections & Detention |  |
Changes in the Company's goodwill balances |  |
Beginning balance | 317,005 | 277,774
Acquisitions (net of dispositions) | (639) | 39,231
Foreign currency translation | 0 | 0
Ending balance | 316,366 | 317,005
GEO Care |  |
Changes in the Company's goodwill balances |  |
Beginning balance | 461,499 | 337,257
Acquisitions (net of dispositions) | (1,910) | 124,242
Foreign currency translation | 0 | 0
Ending balance | 459,589 | 461,499
International Services |  |
Changes in the Company's goodwill balances |  |
Beginning balance | 447 | 402
Acquisitions (net of dispositions) | 0 | 0
Foreign currency translation | (43) | 45
Ending balance | $ 404 | $ 447

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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