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Cash Dividend Distribution (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2017	Jul. 31, 2017	May 31, 2017	Mar. 31, 2017
Dividends Payable [Line Items]
Cash dividends declared		$ 6,624	$ 6,624	$ 6,624	$ 6,624
Cash dividends declared, per share		$ 0.150	$ 0.150	$ 0.150	$ 0.150
First Quarter Previous Year [Member]
Dividends Payable [Line Items]
Dividend payable date	Apr. 17, 2017
Dividends payment, date of record	Mar. 31, 2017
Second Quarter Previous Year [Member]
Dividends Payable [Line Items]
Dividend payable date	Jul. 14, 2017
Dividends payment, date of record	Jun. 30, 2017
Third Quarter Previous Year [Member]
Dividends Payable [Line Items]
Dividend payable date	Oct. 16, 2017
Dividends payment, date of record	Sep. 30, 2017
Fourth Quarter Previous Years [Member]
Dividends Payable [Line Items]
Dividend payable date	Jan. 12, 2018
Dividends payment, date of record	Dec. 31, 2017

X

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15)(5))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 210
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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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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.

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