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Dividends Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Dividends per Share [Abstract] |  |  |  |
Cash dividend declared (in dollars per share) | $ 0.135 | $ 0.20 | $ 0.16 |
Payment of cash dividends |  | $ 48,374 | $ 36,638 | $ 31,189
Date dividend to be paid |  | Mar. 13, 2013 |  |
Date of record of stockholders to whom dividends will be paid |  | Feb. 22, 2013 |  |

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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=6959260&loc=d3e187085-122770 + Details
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