Represents the number of shares counted by each award against the aggregate share limit.

No definition available.

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- Definition

Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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.

+ Details

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- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:sharesItemType
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- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Details

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- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

- Details

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Namespace Prefix:
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Stock-Based Compensation - Stock Incentive Plan - Narratives (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 26, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 30, 2013
Stock-Based Compensation
Treasury stock purchased		$ 2,007	$ 1,759	$ 2,788
2013 Plan
Stock-Based Compensation
Maximum number of shares available under the Plan					10,100,000
Additional shares authorized (shares)	2,832,994
Treasury stock purchased, shares		212,080
Treasury stock purchased		$ 2,000
2013 Plan \| On the settlement of employee stock purchase plan shares
Stock-Based Compensation
Number of shares counted by each award					1
2013 Plan \| Stock-settled award other than an option, stock appreciation right or award for which the recipient pays intrinsic value
Stock-Based Compensation
Number of shares counted by each award					1.75