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Quarterly Financial Data (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 [Abstract]                      
Total revenue $ 179,240 $ 149,695 $ 132,385 $ 134,626 $ 144,981 $ 132,852 $ 120,138 $ 120,373 $ 595,946 $ 518,344 $ 421,454
Cost of revenue 79,405 63,757 57,557 56,565 66,573 57,126 51,501 50,385 257,284 225,585 175,299
Net revenue 99,835 85,938 74,828 78,061 78,408 75,726 68,637 69,988 338,662 292,759 246,155
Total expenses and other income 58,783 55,961 49,890 51,417 46,588 47,642 45,285 45,563 216,051 185,078 166,223
Income from continuing operations 27,684 19,636 16,333 17,452 21,216 18,252 15,179 15,876 81,105 70,523 51,302
Income (loss) from discontinued operations, net of tax (75) (747) 16 60 239 181 159 6,680 (746) 7,259 6,356
Net income $ 27,609 $ 18,889 $ 16,349 $ 17,512 $ 21,455 $ 18,433 $ 15,338 $ 22,556 $ 80,359 $ 77,782 $ 57,658
Diluted income per share:                      
Income from continuing operations, net of tax (diluted) (in dollars per share) $ 0.93 $ 0.67 $ 0.56 $ 0.57 $ 0.69 $ 0.58 $ 0.48 $ 0.49 $ 2.73 $ 2.24 $ 1.65
Income (loss) from discontinued operations, net of tax (diluted) (in dollars per share) $ 0.00 $ (0.03) $ 0.00 $ 0.01 $ 0.01 $ 0.01 $ 0.00 $ 0.21 $ (0.03) $ 0.23 $ 0.21
Net income per diluted share (in dollars per share) $ 0.93 $ 0.64 $ 0.56 $ 0.58 $ 0.70 $ 0.59 $ 0.48 $ 0.70 $ 2.70 $ 2.47 $ 1.86
Diluted weighted average shares 29,666 29,430 29,404 30,353 30,854 31,195 31,869 32,075 29,713 31,498 31,058