Fair Value Measurements Schedule Of Fair Value Of Assets (Details) - Fair value, measurements, recurring - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value Measurements [Line Items]
Assets measured at fair value	$ 23,091	$ 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	1,703	1,702
Mutual Funds \| Investments, employee benefit plans, at fair value
Fair Value Measurements [Line Items]
Mutual funds and money market funds, fair value	21,388	20,869
Level 1
Fair Value Measurements [Line Items]
Assets measured at fair value	21,388	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	21,388	20,869
Level 2
Fair Value Measurements [Line Items]
Assets measured at fair value	1,703	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	1,703	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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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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

No definition available.

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

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.

+ References

No definition available.

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