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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Data [Abstract]                      
Total revenue $ 185,203 $ 173,379 $ 142,354 $ 159,912 $ 178,257 $ 148,700 $ 131,505 $ 133,629 $ 660,848 $ 592,091 $ 513,997
Cost of revenue 85,011 79,404 58,207 68,652 79,200 63,518 57,379 56,456 291,274 256,553 224,742
Net revenue 100,192 93,975 84,147 91,260 99,057 85,182 74,126 77,173 369,574 335,538 289,255
Total expenses and other income 64,377 64,524 60,387 60,094 58,116 55,294 49,243 50,648 249,382 213,301 182,168
Income from continuing operations 25,518 23,127 15,654 20,180 27,612 19,578 16,297 17,375 84,479 80,862 70,137
Income (loss) from discontinued operations, net of tax (740) 14 9 84 (3) (689) 52 137 (633) (503) 7,645
Net income $ 24,778 $ 23,141 $ 15,663 $ 20,264 $ 27,609 $ 18,889 $ 16,349 $ 17,512 $ 83,846 $ 80,359 $ 77,782
Diluted income per share:                      
Income from continuing operations, net of tax (diluted) (in dollars per share) $ 0.87 $ 0.79 $ 0.53 $ 0.68 $ 0.93 $ 0.67 $ 0.56 $ 0.57 $ 2.86 $ 2.72 $ 2.23
Income (loss) from discontinued operations, net of tax (diluted) (in dollars per share) $ (0.03) $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ (0.03) $ 0.00 $ 0.01 $ (0.02) $ (0.02) $ 0.24
Net income per diluted share (in dollars per share) $ 0.84 $ 0.79 $ 0.53 $ 0.68 $ 0.93 $ 0.64 $ 0.56 $ 0.58 $ 2.84 $ 2.70 $ 2.47
Diluted weighted average shares 29,393 29,353 29,603 29,955 29,666 29,430 29,404 30,353 29,574 29,713 31,498