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Equity (Details) (USD $) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 28, 2014 | Jul. 31, 2013 | Feb. 28, 2013 | Dec. 31, 2013 item | Dec. 31, 2012 | Dec. 31, 2011 | May 16, 2012 | May 31, 2005
Common Stock |  |  |  |  |  |  |  |
Common stock quarterly dividend per share, after increase (in dollars per share) | $ 0.35 | $ 0.33 | $ 0.30 | $ 1.26 | $ 0.80 | $ 0.48 |  |
Common stock quarterly dividend per share, before increase (in dollars per share) |  |  | $ 0.25 |  |  |  |  |
Number of common stock share authorized before amendment to Restated Articles of Incorporation |  |  |  |  |  |  | 100,000,000 |
Number of common stock shares authorized |  |  |  | 200,000,000 | 200,000,000 |  | 200,000,000 |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |
Votes per share of common stock |  |  |  | 1 |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |  |
Number of shares authorized by the Board of Directors to be repurchased under stock repurchase program |  |  |  |  |  |  |  | 12,000,000
Remaining number of common stock authorized for repurchase under stock repurchase program (in shares) |  |  |  | 7,883,033 |  |  |  |
Number of shares repurchased under stock repurchase program |  |  |  | 0 | 0 | 0 |  |
Preferred Stock |  |  |  |  |  |  |  |
Preferred stock, authorized shares |  |  |  | 5,000,000 | 5,000,000 |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |
Preferred stock, issued shares |  |  |  | 0 | 0 |  |  |
Preferred stock, outstanding shares |  |  |  | 0 | 0 |  |  |
Minimum number of series in which preferred shares may be issued |  |  |  | 1 |  |  |  |

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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=27012166&loc=d3e187085-122770 + Details
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