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Stockholders' Equity (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Summary of dividends declared on its outstanding shares of common stock to its shareholders |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per share declared on outstanding common stock | $ 0.20 | $ 0.08 | $ 0.08 | $ 0.10 | $ 0.14 | $ 0.08 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.12 | $ 0.46 | $ 0.32 | $ 0.32
Aggregate amount | $ 8,174 | $ 3,270 | $ 3,214 | $ 4,012 | $ 5,611 | $ 3,199 | $ 3,939 | $ 3,917 | $ 3,917 | $ 4,700 | $ 18,956 | $ 12,770 | $ 12,553

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- Definition Equity impact of cash dividends declared by an entity during the period for all classes of stock (common, preferred, etc.). This element includes paid and unpaid dividends declared during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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