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Consolidated Statements of Stockholders' Equity (Parentheticals) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Statement of Stockholders' Equity [Abstract] |  |  |
Dividends per common share (in dollars per share) | $ 0.32 | $ 0.32 | $ 0.33
Expenses in sale of common stock secondary offerings | $ 809 | $ 262 | $ 413

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