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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) (USD $) | 3 Months Ended | 12 Months Ended |  |  |  |
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Mar. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2011
Statement Of Stockholders Equity [Abstract] |  |  |  |  |  |  |  |
Dividends declared and paid, per share | $ 0 | $ 0.30 | $ 0.15 |  | $ 0.30 | $ 0.25 | $ 0.15 | $ 0.03
Per share value of common stock issued | $ 1.00 | $ 6.25 | $ 7.50 | $ 15.00 |  |  |  |
Issuance of restricted common stock, per share |  |  | $ 7.50 | $ 15.00 |  |  |  |

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- Definition Amount per share assigned to the consideration received for shares issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 915 -SubTopic 215 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6472370&loc=d3e38297-110927 + Details
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