Dividend Payment (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended	9 Months Ended
Sep. 21, 2020	Jun. 08, 2020	Mar. 16, 2020	Oct. 03, 2020	Oct. 05, 2019	Oct. 03, 2020	Oct. 05, 2019
Dividend Payment
Common Stock, Dividends, Per Share, Cash Paid	$ 0.14	$ 0.125	$ 0.125
Dividends, Common Stock, Cash	$ 2,000	$ 1,700	$ 1,800	$ 1,984	$ 1,805	$ 5,515	$ 5,423

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

Reference 1: 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

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