Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Details)

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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
Schedule of Company's Quarterly results                      
Total revenues $ 44,379 $ 42,283 $ 37,962 $ 32,642 $ 30,542 $ 32,040 $ 31,334 $ 29,262 $ 157,266 $ 123,178 $ 98,052
Income (loss) from operations 2,022 920 (1,132) 1,232 2,445 3,226 3,151 2,554 3,042 11,376 1,310
Net income (loss) $ (158) $ 551 $ (668) $ 740 $ 1,829 $ 1,925 $ 2,447 $ 1,404 $ 465 $ 7,605 $ (626)
Net income (loss) per share                      
Basic $ (0.01) $ 0.02 $ (0.02) $ 0.02 $ 0.06 $ 0.06 $ 0.08 $ 0.04 $ 0.01 $ 0.24 $ (0.05)
Diluted $ (0.01) $ 0.02 $ (0.02) $ 0.02 $ 0.06 $ 0.06 $ 0.07 $ 0.04 $ 0.01 $ 0.23 $ (0.05)