Fair Value Measurements Schedule Of Fair Value Of Assets (Details) - Fair value, measurements, recurring - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value Measurements [Line Items]
Assets measured at fair value	$ 23,718	$ 72,990
Money market funds \| Cash and cash equivalents
Fair Value Measurements [Line Items]
Money market funds, included in cash and cash equivalents		50,419
Money market funds \| Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	1,790	1,702
Mutual Funds \| Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	21,928	20,869
Level 1
Fair Value Measurements [Line Items]
Assets measured at fair value	21,928	20,869
Level 1 \| Money market funds \| Cash and cash equivalents
Fair Value Measurements [Line Items]
Money market funds, included in cash and cash equivalents		0
Level 1 \| Money market funds \| Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	0	0
Level 1 \| Mutual Funds \| Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	21,928	20,869
Level 2
Fair Value Measurements [Line Items]
Assets measured at fair value	1,790	52,121
Level 2 \| Money market funds \| Cash and cash equivalents
Fair Value Measurements [Line Items]
Money market funds, included in cash and cash equivalents		50,419
Level 2 \| Money market funds \| Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	1,790	1,702
Level 2 \| Mutual Funds \| Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	0	0
Level 3
Fair Value Measurements [Line Items]
Assets measured at fair value	0	0
Level 3 \| Money market funds \| Cash and cash equivalents
Fair Value Measurements [Line Items]
Money market funds, included in cash and cash equivalents		0
Level 3 \| Money market funds \| Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	0	0
Level 3 \| Mutual Funds \| Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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