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Goodwill and Other Intangible Assets - Summary of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Subject to amortization: |  |
Accumulated Amortization | $ (145,129) | $ (132,012)
Total | 35,927 | 46,700
Not subject to amortization: |  |
Tradenames | 1,295,614 | 1,307,633
Gross Carrying Amount, Total | 1,476,670 | 1,486,345
Net Carrying Amount, Total | 1,331,541 | 1,354,333
Tradenames |  |
Not subject to amortization: |  |
Tradenames | 1,295,614 | 1,307,633
Student rosters |  |
Subject to amortization: |  |
Gross Carrying Amount | 98,266 | 96,712
Accumulated Amortization | (96,558) | (92,567)
Total | $ 1,708 | $ 4,145
Not subject to amortization: |  |
Weighted Average Amortization Period (Yrs) | 1 year 9 months 22 days | 2 years 8 months 15 days
Other |  |
Subject to amortization: |  |
Gross Carrying Amount | $ 82,790 | $ 82,000
Accumulated Amortization | (48,571) | (39,445)
Total | $ 34,219 | $ 42,555
Not subject to amortization: |  |
Weighted Average Amortization Period (Yrs) | 11 years 4 months 26 days | 11 years 9 months 22 days

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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