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Cash Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended
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Oct. 18, 2015 | Aug. 17, 2015 | Jul. 30, 2015 | May. 18, 2015 | Apr. 28, 2015 | Feb. 17, 2015 | Jan. 30, 2015 | Nov. 17, 2014 | Oct. 30, 2014 | Aug. 18, 2014 | Jul. 31, 2014 | May. 16, 2014 | Apr. 29, 2014 | Mar. 28, 2014 | Feb. 25, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared per common stock (in dollars per share) |  |  | $ 0.15 |  | $ 0.15 |  | $ 0.15 |  | $ 0.15 |  | $ 0.15 |  | $ 0.15 |  | $ 0.15 |  |
Total Dividends |  | $ 10,500 |  | $ 10,400 |  | $ 10,300 |  | $ 10,300 |  | $ 10,000 |  | $ 10,000 |  | $ 10,000 |  | $ 31,167 | $ 30,047
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared per common stock (in dollars per share) | $ 0.15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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