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Significant Accounting Policies - Graduation Fund (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($)
Consecutive terms of non attendance in which Graduation Fund credits will be lost | item | 1 |
Number of free courses | item | 1 |
Number of successfully completed courses | item | 3 |
Expected collection period of tuition receivable | 12 months |
Balance at beginning of year | $ 29,499,000 | $ 20,937,000
Revenue deferred | 25,360,000 | 20,766,000
Benefit Redeemed | (17,459,000) | (12,204,000)
Balance at end of year | 37,400,000 | 29,499,000
Current Liability [Member] |  |
Graduation fund estimated to be redeemed | 19,100,000 |
Other Assets [Member] |  |
Restricted cash |  |
Minimum protective endowment | 500,000 |
Other Current Assets [Member] |  |
Restricted cash |  |
Restricted cash | $ 15,000 | $ 13,000

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- Definition Current year redemptions of graduation fund credits by students. + References No definition available. + Details
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- Definition Represents the number of consecutive term of non-attendance in which Graduation Fund credits will be lost. + References No definition available. + Details
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- Definition The estimated amount of graduation fund to be redeemed in the next twelve months. + References No definition available. + Details
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- Definition Expected collection period of tuition receivable. + References No definition available. + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to graduation fund liability. + References No definition available. + Details
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- Definition Represents the number of free courses. + References No definition available. + Details
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- Definition Additional graduation fund liability generated in the current year for services to be performed in the future. + References No definition available. + Details
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