v2.4.0.6

Quarterly financial data (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Quarterly financial data (unaudited) |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 28,000 | $ 26,017 | $ 24,302 | $ 24,187 | $ 25,899 | $ 24,688 | $ 22,943 | $ 21,028 | $ 102,506 | $ 94,558 | $ 80,420
Income from operations | 2,074 | 4,129 | 2,236 | 2,407 | 4,040 | 2,981 | 2,427 | 1,729 | 10,846 | 11,177 | 7,355
Net (loss) income attributable to common stockholders | 1,400 | 2,777 | 1,461 | 1,657 | 1,855 | 1,662 | 1,293 | (148) | 7,295 | 4,662 | 10,554
Basic earnings per share (in dollars per share) | $ 0.04 | $ 0.08 | $ 0.04 | $ 0.05 | $ 0.06 | $ 0.05 | $ 0.06 | $ (0.03) | $ 0.21 | $ 0.19 | $ 1.81
Diluted earnings per share (in dollars per share) | $ 0.04 | $ 0.07 | $ 0.04 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.05 | $ (0.03) | $ 0.20 | $ 0.17 | $ 0.49
Increased net income attributable to common stockholders |  |  |  |  |  |  |  |  | $ 243 |  |

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