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Summary of Significant Accounting Policies (Details 2) - $ / shares | Jun. 09, 2017 | Jun. 10, 2016 | Jun. 05, 2015
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Dividend Payable 1 [Member] |  |  |
Dividend Date | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Record Date | Jun. 19, 2017 | Jun. 16, 2016 | Jun. 16, 2015
Dividend per share | $ 0.51 | $ 0.51 | $ 0.51
Dividend Payable 2 [Member] |  |  |
Dividend Date | Sep. 29, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Record Date | Sep. 15, 2017 | Sep. 15, 2016 | Sep. 15, 2015
Dividend per share | $ 0.51 | $ 0.51 | $ 0.51
Dividend Payable 3 [Member] |  |  |
Dividend Date | Dec. 29, 2017 | Dec. 30, 2016 | Dec. 31, 2015
Record Date | Dec. 15, 2017 | Dec. 14, 2016 | Dec. 15, 2015
Dividend per share | $ 0.51 | $ 0.51 | $ 0.51
Dividend Payable 4 [Member] |  |  |
Dividend Date | Mar. 30, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Record Date | Mar. 15, 2018 | Mar. 15, 2017 | Mar. 16, 2016
Dividend per share | $ 0.51 | $ 0.51 | $ 0.51

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- 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 + Details
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