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=109259400&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=27012166&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=6877327&loc=d3e13212-122682

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

Subsequent Events (Details) - USD ($)	2 Months Ended	12 Months Ended
Subsequent Events (Details) - USD ($)	Feb. 28, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 24, 2019
Subsequent Events [Abstract]
Authorized repurchase amount					$ 125,000,000
Subsequent Event [Line Items]
Common stock repurchased		$ 1,297,000	$ 648,000	$ 397,000
Subsequent Event
Subsequent Event [Line Items]
Common stock repurchased (in shares)	576,469
Common stock repurchased	$ 37,100,000