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Dividends per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Payment of cash dividends |  |  |  |  |  |  |  |  | $ 78,438 | $ 81,187 | $ 81,371
Dividend Declared 2015-Q1 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  |  |  |  |  |  | $ 0.35 |  |  |
Dividend Declared 2015-Q2 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  |  |  |  |  | $ 0.35 |  |  |  |
Dividend Declared 2015-Q3 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  |  |  |  | $ 0.35 |  |  |  |  |
Dividend Declared 2015-Q4 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  |  |  | $ 0.35 |  |  |  |  |  |
Dividend Declared 2016-Q1 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  |  | $ 0.355 |  |  |  |  |  |  |
Dividend Declared 2016-Q2 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  |  | $ 0.355 |  |  |  |  |  |  |  |
Dividend Declared 2016-Q3 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) |  | $ 0.355 |  |  |  |  |  |  |  |  |
Dividend Declared 2016-Q4 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash dividend paid (in dollars per share) | $ 0.355 |  |  |  |  |  |  |  |  |  |
Dividend Declared 2017-Q1 [Member] |  |  |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Dividend payable per share (in dollars per share) | $ 0.36 |  |  |  |  |  |  |  | $ 0.36 |  |
Dividend payable, date to be paid |  |  |  |  |  |  |  |  | Mar. 15, 2017 |  |
Dividend payable, date of record |  |  |  |  |  |  |  |  | Feb. 27, 2017 |  |

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- Definition Aggregate dividends paid 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 + Details
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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=6367179&loc=d3e4304-108586 + Details
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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=6367179&loc=d3e4304-108586 + 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=66902209&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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