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Summary Selected Quarterly Financial Data (unaudited) (Details) (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 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Summary of selected unaudited consolidated quarterly financial data |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 75,066 | $ 68,511 | $ 79,093 | $ 70,260 | $ 74,650 | $ 69,774 | $ 73,450 | $ 65,742 | $ 292,930 | $ 283,616 | $ 250,726
Income from operations | 7,393 | 7,177 | 11,461 | 4,628 | 13,434 | 9,749 | 9,616 | 4,198 |  |  |
Net income | $ 4,251 | $ 10,373 | $ 7,769 | $ 3,181 | $ 8,897 | $ 5,732 | $ 5,470 | $ 2,911 | $ 25,574 | $ 23,010 | $ 20,507
Basic income per common share | $ 0.19 | $ 0.46 | $ 0.34 | $ 0.14 | $ 0.39 | $ 0.25 | $ 0.24 | $ 0.13 | $ 1.14 | $ 1.02 | $ 0.91
Diluted income per common share | $ 0.19 | $ 0.45 | $ 0.34 | $ 0.14 | $ 0.38 | $ 0.25 | $ 0.24 | $ 0.13 | $ 1.12 | $ 0.99 | $ 0.89

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