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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Data [Abstract]                      
Total revenue $ 191,424 $ 169,532 $ 167,623 $ 176,023 $ 202,774 $ 175,000 $ 165,326 $ 169,777 $ 704,602 $ 712,877 $ 660,848
Cost of revenue 88,499 74,090 73,577 77,252 91,141 76,137 71,405 73,321 313,418 312,004 291,274
Net revenue 102,925 95,442 94,046 98,771 111,633 98,863 93,921 96,456 391,184 400,873 369,574
Total expenses and other income 75,298 79,208 74,615 74,382 74,940 70,983 70,522 67,448 303,503 283,893 249,382
Income from continuing operations         26,941 19,528 16,015 22,954 60,710 85,438 84,479
Income (loss) from discontinued operations, net of tax         0 0 0 (272) 0 (272) (633)
Net income $ 19,410 $ 11,173 $ 13,339 $ 16,788 $ 26,941 $ 19,528 $ 16,015 $ 22,682 $ 60,710 $ 85,166 $ 83,846
Diluted income per share:                      
Income from continuing operations, net of tax (diluted) (in dollars per share)         $ 0.94 $ 0.68 $ 0.55 $ 0.78 $ 2.14 $ 2.94 $ 2.86
Income (loss) from discontinued operations, net of tax (diluted) (in dollars per share)         0.00 0.00 0.00 (0.01) 0.00 (0.01) (0.02)
Net income per diluted share (in dollars per share) $ 0.69 $ 0.40 $ 0.47 $ 0.59 $ 0.94 $ 0.68 $ 0.55 $ 0.77 $ 2.14 $ 2.93 $ 2.84
Diluted weighted average shares 28,097 28,224 28,411 28,620 28,804 28,805 29,341 29,342 28,326 29,070 29,574