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- Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Accounts and notes receivable | $ 399,322,000 | $ 474,456,000
Deferred revenue and student deposits, current | 193,226,000 | 184,116,000
Capitalized contract cost | 11,500,000 | 0
Capitalized contract cost, accumulated amortization | 4,400,000 | $ 0
Amortization of capitalized costs | $ 4,400,000 |
Minimum |  |
Disaggregation of Revenue [Line Items] |  |
Contract cost, amortization period | 2 years |
Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Contract cost, amortization period | 4 years |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Remaining performance obligation, expected timing of satisfaction | 12 months |
Commission and Bonuses |  |
Disaggregation of Revenue [Line Items] |  |
Remaining performance obligations recognition period | one year or less |
Incremental Costs Of Obtaining A Contract With Customer |  |
Disaggregation of Revenue [Line Items] |  |
Remaining performance obligations recognition period | one year or less |
Incremental Cost Of Obtaining A Contract With Students |  |
Disaggregation of Revenue [Line Items] |  |
Remaining performance obligations recognition period | one year or less |

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- Definition The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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