Number of shares that have been repurchased during the period and are being held in treasury.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 3: 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(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Treasury Stock - Narrative (Details) - shares	1 Months Ended	6 Months Ended
Treasury Stock - Narrative (Details) - shares	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Jul. 28, 2021	Apr. 28, 2021
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased (in shares)		511,000	172,000
May 2021 Program
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase of common stock (in shares)					300,000
Number of shares repurchased (in shares)	300,000
August 2021 Program \| Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase of common stock (in shares)				400,000