Annual report pursuant to Section 13 and 15(d)

Summarized Quarterly Financial Information (unaudted) (Details)

v2.4.0.6
Summarized Quarterly Financial Information (unaudted) (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 Information Disclosure [Abstract]                      
Total revenues $ 28,677 $ 27,402 $ 25,360 $ 29,294 $ 31,811 $ 33,550 $ 36,834 $ 25,449 $ 110,733 $ 127,644 $ 89,882
Income from operations 2,652 2,563 2,759 2,716 9,108 10,524 14,201 5,789 10,690 39,622 21,179
Net income $ (435) $ (1,105) $ 3,799 $ 488 $ 73,949 $ 8,406 $ 19,877 $ 4,164 $ 2,747 $ 106,396 $ 8,386
Basic net income (loss) per share (in dollars per share) $ (0.01) $ (0.03) $ 0.10 $ 0.01 $ 1.88 $ 0.21 $ 0.51 $ 0.12 $ 0.07 $ 2.81 $ 0.29
Diluted net income (loss) per share (in dollars per share) $ (0.01) $ (0.03) $ 0.09 $ 0.01 $ 1.85 $ 0.21 $ 0.50 $ 0.12 $ 0.07 $ 2.76 $ 0.28