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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2011
Condensed Consolidated Statements of Stockholders' Equity [Abstract] |  |  |
Deferred compensation plan held Rabbi Trust | 32,903 | 32,903 | 30,597
Share issued under the performance incentive plan withheld for employee taxes |  | 5,670 | 12,324
Cash dividends declared per share of common stock | $ 0.365 | $ 0.710 | $ 1.365

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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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