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Quarterly Results Quarterly Results (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 Results [Abstract]                      
Total revenue $ 120,051 $ 122,472 $ 110,190 $ 94,706 $ 95,045 $ 95,413 $ 93,782 $ 86,628 $ 447,419 $ 370,868 $ 326,565
Gross profit 64,299 67,344 59,685 53,631 52,971 55,722 54,494 50,487 244,959 213,674 194,426
Income from operations 9,875 6,185 (1,877) 5,252 10,599 16,034 14,487 9,808 19,435 50,928 46,024
Income before provision for income taxes 7,342 4,629 (3,446) 4,800 10,760 15,923 14,688 9,886 13,325 51,257 45,936
Net income $ 3,270 $ 2,825 $ (2,271) $ 2,759 $ 6,351 $ 10,214 $ 9,362 $ 7,293 $ 6,583 $ 33,220 $ 29,187
Earnings per share, Basic $ 0.07 $ 0.06 $ (0.05) $ 0.06 $ 0.15 $ 0.23 $ 0.22 $ 0.17 $ 0.15 $ 0.76 $ 0.68
Earnings per share, Diluted $ 0.07 $ 0.06 $ (0.05) $ 0.06 $ 0.14 $ 0.23 $ 0.21 $ 0.17 $ 0.15 $ 0.75 $ 0.67